Preferably, each network identifier is retrieved based on {HEAD ~ a Mobile Country Code} , {TAIL ~ a Mobile Network Code} , and a Location Area Code  
Preferably , each network identifier is retrieved based on { HEAD ~ a Mobile Country Code } , { TAIL ~ a Mobile Network Code } , and a Location Area Code
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH