Using such a system {TAIL ~ the user} can carefully screen {HEAD ~ calls} that are paid for and more closely control telecommunications service costs 
Using such a system { TAIL ~ the user } can carefully screen { HEAD ~ calls } that are paid for and more closely control telecommunications service costs
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH