Patent ID: 8831628

Claim:
A method, comprising: acquiring a service by a mobile system by receiving information from a base station of a wireless communication network, wherein the information includes a system identification (SID), a local time offset value (LTM_OFF), and a daylight saving time offset (DAYLT); using the LTM_OFF and a mobile country code (MCC) associated with the SID to determine a range of longitude values and latitude values associated with a current location of the mobile system; querying a table with the current location to determine a geographical region associated with the current location, the table stored on the mobile system, the geographical region being one of a plurality of geographical regions within a carrier network's scope of operation, wherein a boundary of the geographical region is defined at least in part based on a tag identifying a previous location of a device while receiving a signal associated with the geographical region; and using the geographical region to access a scan list to identify one or more frequencies to be scanned for communicating with the wireless communication network, the scan list stored on the mobile system.