blackhole- secret revealed: Your Cell Phone's Been Crippled
Cingular generally doesn't give out unlock codes for its phones.To tether you to their service, carriers "lock" phones so you can't use them on a competitor's network.
And sometimes carriers disable other features as well
. But with a little time and effort (and spare change), you might be able to unlock your phone regardless of whether your carrier cooperates.[[full article]]