Quote:
Originally Posted by rfranzq
When I first noted AT&T, if phones, were turned off, would go back to AT&T when turned off and back on even if they were on T-Mobile. Now, most of the time, If they are on AT&T, they will go to T-Mobile when turned back on.
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This probably means that the SIM has an embedded PRL. It might allow you to select T-Mobile in an area where there is no AT&T service. If it is a multi-IMSI SIM and it sees one of its IMSI net numbers it will take on the ATT identity and will be restricted by their roaming table. Probably based on the LAC of the cells it sees.