fig2 depicts telecommunications system 200 in accordance with the illustrative embodiment of the present invention . telecommunications system 200 comprises : telecommunications terminals 201 - 1 through 201 - k , wherein k is a positive integer , and server 202 , interrelated as shown . users 203 - 1 through 203 - m , wherein m is a positive integer , use telecommunications terminals 201 - 1 through 201 - k . three terminals and four users are depicted in fig2 . it will be clear , however , to those who are skilled in the art , after reading this disclosure , how to make and use telecommunications system 200 so that the numbers of terminals and users are different than those shown in fig2 . in other words , the value for k can be different than three and the value for m can be different than four . furthermore , the value for k can be greater than , equal to , or less than the value for m . telecommunications terminal 201 - k , where k is between 1 and k , is a device that is capable of communicating , in well - known fashion , with other telecommunications terminals that are within or external to telecommunications system 200 . in accordance with the illustrative embodiment of the present invention , telecommunications terminal 201 - k is a cellular telephone that is capable of originating and receiving ( i . e ., “ terminating ”) telecommunications calls across a user - traffic communications channel in well - known fashion . terminal 201 - k is also capable of performing all of the tasks described below and with respect to fig7 through 9 . the salient components of terminal 201 - k are described below and with respect to fig3 . it will be clear to those skilled in the art , after reading this disclosure , how to make and use terminal 201 - k . in accordance with the illustrative embodiment of the present invention , terminals 201 - 1 through 201 - k exchange user profile information with each other . user profiles are described below and with respect to fig4 and 5 . terminals 201 - 1 through 201 - k exchange user profile information directly with each other across a synchronization communications channel and in accordance with the wi - fi protocol , where “ wi - fi ” is short for “ wireless fidelity ” and is associated with the family of protocols known as institute of electrical and electronics engineers ( ieee ) 802 . 11 . it will , however , be clear to those skilled in the art , after reading this disclosure , how to make and use alternative embodiments with terminals that exchange user profile information directly with each other in accordance with other protocols ( e . g ., bluetooth , etc .). furthermore , it will be clear to those skilled in the art , after reading this disclosure , how to make and use embodiments of the present invention with terminals that exchange user profile information through the same wireless infrastructure , such as gsm or 3g umts , that is used to carry voice and other user - related traffic between the users of terminals 201 - 1 through 201 - k across the user - traffic communications channel . terminals 201 - 1 through 201 - k , in accordance with the illustrative embodiment , use the syncml protocol , as is known in the art , to synchronize the multiple user profiles across terminals . as those who are skilled in the art will appreciate , other protocols can be used communicate peer - to - peer for the purpose of synchronizing the user profiles . session - initiation protocol ( sip ) is an example of such a protocol . in some alternative embodiments , some of terminals 201 - 1 through 201 - k are telecommunications devices other than a cellular telephone . examples of other telecommunications devices include , but are not limited to , an internet - protocol ( ip ) deskset , a session - initiation protocol ( sip ) deskset , a personal digital assistant ( pda ), a personal computer , and so forth . for example , a first terminal might be a cellular telephone , a second terminal might be a laptop , a third terminal might be a personal digital assistant , and so forth . in those embodiments , some or all of terminals 201 - 1 through 201 - k are terminals with wired connections to a telecommunications network for the purpose of communicating with other terminals , while some terminals might still be wireless ( i . e ., cellular or otherwise ). server 202 is a store - and - forward device that is capable of exchanging information with one or more terminals 201 . for example , server 202 might be an access point , as is known in the art . in some embodiments of the present invention , server 202 might be used to receive user profile information from a first terminal , such as terminal 201 - 1 , and to forward the user profile information to a second terminal , such as terminal 201 - 2 . when the second terminal is unavailable , server 202 is able to store the user profile information , along with forwarding instructions from the first terminal , until the second terminal becomes available . it will be clear to those skilled in the art how to make and use server 202 . user 203 - m , where m is between 1 and m , uses one or more of terminals 201 - 1 through 201 - k in order to communicate with other terminals or users . user 203 - m , also referred to as “ user u m ”, has an associated user profile . the user profile of user u m comprises data associated with user u m that includes , but is not limited to : i . user u m &# 39 ; s identification , ii . user u m &# 39 ; s contact list , iii . user u m &# 39 ; s appointment calendar , iv . user u m &# 39 ; s to - do list , v . the call / message activity of user u m , and vi . the user preferences of user u m . the user profile is described below and with respect to fig4 and 5 . terminals 201 - 1 through 201 - k and users u 1 through u m are part of a device / user group , in which multiple terminals and users are associated with each other . device / user groups are described in detail below and with respect to fig4 . for example , terminals 201 - 1 through 201 - k and users u 1 through u m might be part of a work - related group or a family - related group . as those who are skilled in the art will appreciate , however , some of terminals 201 - 1 through 201 - k might or might not be part of the same pre - existing service plan ( e . g ., a cellular service provider &# 39 ; s family plan , etc .). as members in a device / user group , terminals 201 - 1 through 201 - k and users u 1 through um are associated with each other without there being a fixed , one - to - one correspondence between a terminal and a user in the group . for example , although user u 1 might on occasion use terminal 201 - 1 , user u 1 might also use terminal 201 - 3 and user u 4 might use terminal 201 - 1 . in other words , terminals 201 - 1 through 201 - k are available to one or more users u 1 through u m . in accordance with the illustrative embodiment of the present invention , a user identifies himself or herself to a terminal by initially logging into the terminal . the terminal authenticates the user by verifying a user - entered password or personal identification number against the user name that the user logged in with . as those who are skilled in the art will appreciate , a variety of other methods exist that enable user identification . for example , in some alternative embodiments a user can self - identify to a terminal by inserting a personalized subscriber identity module ( sim ) card into a memory slot of the terminal . in some other alternative embodiments , a user can self - identify by speaking into the microphone of a terminal that is capable of speech verification . fig3 depicts a block diagram of the salient components of telecommunications terminal 201 - k , in accordance with the illustrative embodiment of the present invention . telecommunications terminal 201 - k comprises : receiver 301 , processor 302 , memory 303 , transmitter 304 , keypad 305 , clock 306 , video display 307 , and speaker 308 , interconnected as shown . receiver 301 receives signals from other terminals 201 , server 202 , and network infrastructure outside of telecommunications system 200 , and forwards the information encoded in the signals to processor 302 , in well - known fashion . in accordance with the illustrative embodiment , receiver 301 enables two wireless , physical layer interfaces : ( i ) the interface for communicating voice and other user - related data via the user - traffic communications channel as part of a call and ( ii ) the interface for exchanging user profile information with other terminals via the synchronization channel . it will be clear to those skilled in the art , after reading this disclosure , how to make and use transceiver 301 . processor 302 is a general - purpose processor that is capable of : receiving information from receiver 301 and keypad 305 ; reading data from and writing data into memory 303 ; executing the tasks described below and with respect to fig7 through 9 ; and transmitting information to transmitter 304 , video display 307 , and speaker 308 . in some alternative embodiments of the present invention , processor 302 might be a special - purpose processor . in either case , it will be clear to those skilled in the art , after reading this disclosure , how to make and use processor 302 . memory 303 is a non - volatile random - access memory that stores the instructions and data used by processor 302 . memory 303 stores the data that is described below and with respect to fig4 through 6 . it will be clear to those skilled in the art , after reading this disclosure , how to make and use memory 303 . transmitter 304 receives information from processor 302 , and outputs signals that encode this information to other terminals 201 , server 202 , and network infrastructure external to telecommunications system 200 , in well - known fashion . in accordance with the illustrative embodiment , transmitter 304 enables the same wireless , physical layer interfaces that receiver 301 enables . it will be clear to those skilled in the art , after reading this disclosure , how to make and use transmitter 304 . keypad 305 is a character and user - selection input device as is well - known in the art that receives input from a user and transmits keypad signals representing that input . it will be clear to those skilled in the art how to make and use keypad 305 . clock 306 maintains and distributes time and date information . it will be clear to those skilled in the art how to make and use clock 306 . video display 307 is a display output device as is well - known in the art that receives a video signal and creates a visual image of the signal for a user . it will be clear to those skilled in the art how to make and use video display 307 . speaker 308 is an acoustic output device as is well - known in the art that receives an audio signal and creates an audible representation of the signal for a user . it will be clear to those skilled in the art how to make and use speaker 308 . fig4 depicts a block diagram of how information is stored and organized in memory 303 of terminal 201 - k , in accordance with the illustrative embodiment of the present invention . the information stored in memory 303 comprises : device / user group 401 ; application software 402 ; and operating system 403 . in turn , device / user group 401 comprises terminal profiles 411 - 1 through 411 - k and user profiles 412 - 1 through 412 - m . as will be appreciated by those skilled in the art , the information that is stored in memory 303 can be organized differently than what is depicted in fig4 . terminal profile 411 - k is a file structure that comprises terminal - specific information about terminal 201 - k such as the electronic serial number , software or firmware version number , and so forth . in accordance with the illustrative embodiment , terminal profile 411 - k further comprises the terminal identifier , which is the address that is used to identify terminal 201 - k to the network . in some alternative embodiments of the present invention , the terminal identifier is instead part of each user &# 39 ; s profile . user profile 412 - m is a file structure that comprises user - specific information about user u m . user profile 412 - m is described below and with respect to fig5 . application software 402 is the software portion of the system described below and with respect to fig7 through 9 . operating system 403 is an operating system that performs input / output , file and memory management , and all of the other functions normally associated with operating systems , in well - known fashion . it will be clear to those skilled in the art how to make and use operating system 403 . fig5 depicts a block diagram of the user profile segments that constitute user profile 412 - m . as will be appreciated by those skilled in the art , the information that is stored for each user profile 412 - m can be organized differently than what is depicted in fig5 . user profile 412 - m , wherein m is a value between 1 and m , is further segmented into user profile segments 412 - m - n , wherein n = 1 through n and n is a positive integer . each user profile segment 412 - m - n is a file structure that comprises information for a particular data group ( of n data groups ) in user u m &# 39 ; s profile . for example , segment 412 - 1 - 3 might comprise information that represents a contact list for user u 1 , while segment 412 - 3 - 2 comprises information that represents a call log associated with user u 3 . a first segment within user u m &# 39 ; s profile stores a contact list . user u m &# 39 ; s contact list segment comprises entries for each contact such as , but not limited to : contact name , title , address , phone number ( s ), speed dial information , email address , and notes . the contact list is also known as an “ address book ” or “ phone book .” a second segment within user u m &# 39 ; s profile stores user preferences . user u m &# 39 ; s user preferences define how the telecommunications terminal that user u m is currently logged into is to behave . user u m &# 39 ; s user preferences segment comprises attributes such as , but not limited to : i . sound settings , including alert sounds and modes ( such as ringtone volumes and privacy / vibrate - only alert modes ), keypad sounds , power on / off sounds , etc . ; ii . display settings , including backlight , banner , alert colors , display brightness , display character set , etc . ; iii . feature settings , including one - touch dialing , answer call mode , auto - answer option , language , etc . ; iv . data and text message settings , including stored messages , downloaded video clips , “ personal shopping ” wallet contents , web browsing history and cookies , see - you - see - me video settings , etc . ; v . game settings , including downloaded games , state of game last used , etc . ; vi . camera settings , including pictures and video taken by camera , image capture modes , etc . ; vii . voice services settings ; viii . location - based service settings , including setting of geo - location privacy mode , etc . ; and ix . synchronization settings , including indications of which user profile information is to be synchronized across terminals or which user profile information is to be excluded from synchronizing across terminals . note that at least some of the settings govern a telecommunications terminal &# 39 ; s behavior when using the user - traffic communications channel ( e . g ., to send or receive calls , etc .). information that allows for compatibility across terminals is also part of the user preferences segment . for example , the user preference for volume might be stored relative to a ten - level scale , but a particular brand of cell phone has only three volume levels . the cell phone would need to know , when receiving a user preference , how to translate a volume setting ( e . g ., level 7 , etc .) that is in terms of the user - specified levels ( e . g ., 1 through 10 , etc .) to a volume setting that is in terms of the phone &# 39 ; s levels ( e . g ., something out of 3 , etc .). the cell phone would be provided with the number of user - specified levels ( e . g ., 10 levels , etc .) to enable the phone to translate the user &# 39 ; s setting to an actual phone setting . in accordance with the illustrative embodiment of the present invention , the information that is transmitted from one terminal to another includes compatibility information ( e . g ., the number or range of volume levels , etc .). the compatibility information can be transmitted once , occasionally , or every time that the corresponding attribute setting is transmitted . it will be clear to those skilled in the art how the receiving terminal can use the compatibility information to translate the attribute settings that are received from the transmitting terminal . furthermore , as those who are skilled in the art will appreciate , there can be other possible techniques to enable compatibility across terminals . a third segment within user u m &# 39 ; s profile is a call log . user u m &# 39 ; s call log is a record of user u m &# 39 ; s call activity ( i . e ., on the user - traffic communications channel ) that consists of one or more call log entries , where each call log entry represents a call event . fig6 depicts an example of an illustrative user profile segment ( i . e ., segment 412 - 3 - 2 ) that represents the call log of a particular user u 3 , in accordance with the illustrative embodiment of the present invention . as will be appreciated by those skilled in the art , the information that is stored for the call log can be organized differently than what is depicted in fig6 . the illustrative call log is a record of call activity that comprises one or more of the following : i . the calls that are made and completed to user u 3 ( i . e ., “ incoming call events ”), as stored in table 601 ; ii . the calls that are originated by user u 3 ( i . e ., “ outgoing call events ”), as stored in table 602 ; and iii . the calls that are made , but not completed , to user u 3 ( i . e ., “ missed call events ”), as stored in table 603 . the illustrative call log , as depicted in fig6 , illustrates a record that consists of call log entries that represent telephone call events . it will , however , be clear to those skilled in the art , after reading this disclosure , how to make and use a call log that provides a record of message activity , where the record of message activity is either integrated with or segregated from the record of telephone call activity . examples of such messages include email messages , short message service [ sms ] messages , multimedia message service [ mms ] messages , instant messaging [ im ] messages , and so forth . a call log that provides a record of message activity is also known as a “ message log .” call logs are described in additional detail in co - pending u . s . patent application ser . no . 10 / 881 , 908 and u . s . patent application ser . no . 10 / 899 , 662 , both of which are incorporated herein by reference . fig7 depicts a flowchart of the salient tasks that are associated with updating one or more user profiles , in accordance with the illustrative embodiment of the present invention . it will be clear to those skilled in the art which tasks depicted in fig7 can be performed simultaneously or in a different order than that depicted . for clarity purposes , the tasks that are subsequently disclosed are described from the perspective of a first telecommunications terminal , namely terminal 201 - 1 , executing the tasks and subtasks . it is also assumed that terminal 201 - 1 is in a device / user group , along with terminals 201 - 2 and 201 - 3 and users u 1 through u 4 . as those who are skilled in the art will appreciate , each of terminals 201 - 2 and 201 - 3 is also executing the tasks described with respect to fig7 through 9 . therefore , synchronization - related messages that comprise portions of user profile information can arrive at terminal 201 - 1 asynchronously from the other terminals . furthermore , some terminals might be unavailable to communicate with terminal 201 - 1 at any given point in time . for example , terminal 201 - 2 might be powered off or out of communications range with terminal 201 - 1 . as those who are skilled in the art will appreciate , the fact that one or more terminals might not be in a state to communicate with terminal 201 - 1 does not affect terminal 201 - 1 &# 39 ; s ability to execute the described tasks . at task 701 , terminal 201 - 1 updates a user profile r j for user u j , based on one or more changes that are attributed to user u j and that have occurred at another telecommunications terminal ( e . g ., terminal 201 - 2 , 202 - 3 , etc .). the subtasks that are associated with task 701 are described below and with respect to fig8 . at task 702 , terminal 201 - 1 checks to see if user u m is logged in ( i . e ., is in a login session on terminal 201 - 1 ). if so , task execution proceeds to task 703 . if not , task execution proceeds to task 705 . at task 703 , when user u m first logs in , terminal 201 - 1 applies u m &# 39 ; s user profile ( i . e ., user profile r m ) to the login session . in other words , user u m &# 39 ; s contact list , user preferences , and call logs are activated and available while user u m is logged in . at task 704 , terminal 201 - 1 updates user u m &# 39 ; s profile ( i . e ., user profile r m ), based on one or more changes that are attributed to u m and that have occurred within terminal 201 - 1 . the subtasks that are associated with task 704 are described below and with respect to fig9 . at task 705 , terminal 201 - 1 checks to see if it has been powered off ( e . g ., by the user pressing the “ end / off ” key , etc .). if so , task execution ends . if not , task execution proceeds back to task 701 . fig8 depicts a flowchart of the salient tasks that constitute task 701 and that are associated with updating one or more user profiles based on changes that have occurred in terminals other than terminal 201 - 1 , in accordance with the illustrative embodiment of the present invention . it will be clear to those skilled in the art which tasks depicted in fig8 can be performed simultaneously or in a different order than that depicted . at task 801 , terminal 201 - 1 checks to see if it is receiving a portion of a user profile . if so , task execution proceeds to task 802 . if not , task execution proceeds to task 702 . at task 802 , terminal 201 - 1 receives , from a second telecommunications terminal ( e . g ., terminal 201 - 2 , etc . ), portion p i of user profile r j that is associated with user u j . for example , user u j , who is logged in to terminal 201 - 2 , might have just received a call on terminal 201 - 2 . the incoming call updated user u j &# 39 ; s call log stored in terminal 201 - 2 as part of user profile r j . terminal 201 - 2 then transmitted the updated portion of the call log over to terminal 201 - 1 , which terminal 201 - 1 receives . as another example , another user u j ′ might have just modified her user preferences on terminal 201 - 3 . the modifying action updated user u j ′ &# 39 ; s user preferences stored in terminal 201 - 3 as part of user profile r j ′ . terminal 201 - 3 then transmitted the updated portion of the user preferences over to terminal 201 - 1 , which terminal 201 - 1 receives . at task 803 , terminal 201 - 1 stores portion p i into user u j &# 39 ; s call log , as part of user profile r j . for example , if portion p i represents a missed call entry , terminal 201 - 1 stores p i as part of the missed - calls events . at task 804 , terminal 201 - 1 optionally transmits portion p i to at least a third telecommunications terminal ( e . g ., terminal 201 - 3 , etc .). the terminal or terminals that are to receive portion p i are selected from device / user group 401 , wherein the addressing information needed to communicate with selected terminal 201 - k is in terminal profile 411 - k . this action provides a way to propagate the updates faster to the other terminals in the device / user group . as those who are skilled in the art will appreciate , telecommunications system 200 might be configured such that a terminal might be out of communications range with some terminals , but can use intermediary terminals to propagate the changed user profile information to those out - of - range terminals . fig9 depicts a flowchart of the salient tasks that constitute task 704 and that are associated with updating user u m &# 39 ; s profile ( i . e ., profile r m ), based on changes that have occurred in terminal 201 - 1 , in accordance with the illustrative embodiment of the present invention . it will be clear to those skilled in the art which tasks depicted in fig9 can be performed simultaneously or in a different order than that depicted . at task 901 , terminal 201 - 1 checks to see if an event is occurring that involves user u m . for example , user u m might be updating his user preferences or contact list , or there might be call activity ( i . e ., incoming call , outgoing call , or missed call ) that affects user u m &# 39 ; s call log . if so , task execution proceeds to task 902 . if not , task execution proceeds to task 705 . at task 902 , terminal 201 - 1 determines that a change has occurred to user profile r m that affects portion p i ′ of profile r m . it will be clear to those skilled in the art how to determine that a change has occurred . at task 903 , terminal 201 - 1 stores portion p i ′ into user u m &# 39 ; s profile r m . for example , if user u m selects a new ringtone for alerting purposes , the selection will be recorded in profile r m . at task 904 , terminal 201 - 1 transmits portion p i ′ to one or more other telecommunications terminals ( e . g ., terminal 201 - 2 , terminal 201 - 3 , etc .). terminal 201 - 1 , in some embodiments , might transmit portion p i ′ only if the synchronization settings in user u m &# 39 ; s profile r m indicate that synchronization is allowed for portion p i ′ . the terminal or terminals that are to receive portion p i ′ are selected from device / user group 401 , wherein the addressing information for selected terminal 201 - k is in terminal profile 411 - k . in some embodiments , terminal 201 - 1 transmits portion p i ′ , based on an amount of time having elapsed since an earlier transmission of a portion of user profile r m . for example , terminal 201 - 1 might hold onto multiple portions before transmitting those portions . terminal 201 - 1 might transmit those held portions periodically or sporadically . one purpose for holding ( or buffering ) multiple portions before transmitting is to optimize transmission efficiency across the synchronization communications channel . in some alternative embodiments of the present invention , terminal 201 - 1 periodically or sporadically negotiates with each of terminal 201 - 2 and terminal 201 - 3 to synchronize bi - directionally one or more portions of user profile r m with each terminal . for example , user u m might have been logged onto terminal 201 - 2 immediately prior to logging onto terminal 201 - 1 . as a result , changes related to user profile r m might have accumulated in both terminals 201 - 1 and 201 - 2 , and would require synchronizing across both of the terminals , instead of just in one direction . note that after user u m logs off of terminal 201 - 1 , a different user u m ′ might log onto terminal 201 - 1 , as would be detected at task 702 . task 703 and the subtasks that constitute task 704 would then apply to user u m ′ and user profile r m ′ . it is to be understood that the above - described embodiments are merely illustrative of the present invention and that many variations of the above - described embodiments can be devised by those skilled in the art without departing from the scope of the invention . for example , in this disclosure , numerous specific details are provided in order to provide a thorough description and understanding of the illustrative embodiments of the present invention . those skilled in the art will recognize , however , that the invention can be practiced without one or more of those details , or with other methods , materials , components , etc . furthermore , in some instances , well - known structures , materials , or operations are not shown or described in detail to avoid obscuring aspects of the illustrative embodiments . it is understood that the various embodiments shown in the figures are illustrative , and are not necessarily drawn to scale . reference throughout the disclosure to “ one embodiment ” or “ an embodiment ” or “ some embodiments ” means that a particular feature , structure , material , or characteristic described in connection with the embodiment ( s ) is included in at least one embodiment of the present invention , but not necessarily all embodiments . consequently , the appearances of the phrase “ in one embodiment ,” “ in an embodiment ,” or “ in some embodiments ” in various places throughout the disclosure are not necessarily all referring to the same embodiment . furthermore , the particular features , structures , materials , or characteristics can be combined in any suitable manner in one or more embodiments . it is therefore intended that such variations be included within the scope of the following claims and their equivalents .