If it unlocked then how it got locked. with which sim card your mobile locked at&t or tmobile. You said you have unlocked mobile does it roaming lock or sim locked. it may possible that your mobile was temporary unlocked on the basis of roaming otherwise your mobile is sim locked.
To unlock your at&t or tmobile smartphone you need to generate unlock code from imei number of your mobile phone. it will generate four kind of unlock code. if your mobile is hard locked then use defreeze code otherwise use nck code. here is how to unlock at&t sim for lg samsung nokia mobile at united states of america , canada and uk.
How to Network Unlock Att Mobile
mobile-cellphones.blogspot.com
Unlock at mobile for samsung galaxy...
SOURCE: problems with 4 wheel drive on 04 Nissan Titan
2004 Nissan Titan when using the kick down and the accelerator pedal is about 75% depressed the RMP go into the red zone then drop to about 25K and comes close to stalling. Why?
SOURCE: t mobile android screen is locked dont have google email info
create a google email account. It's free and you can do it from your computer if you need to
SOURCE: my microwave oven locked and when I press the
The same thing that Locked it will Unlock it. It is a child proof feature. To unlock it:
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