By inserting the access code into the dialed number {HEAD ~ the device} selects {TAIL ~ a particular long distance carrier} for the duration of the call 
selects
By inserting the access code into the dialed number { HEAD ~ the device } selects { TAIL ~ a particular long distance carrier } for the duration of the call
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH