T-mobile iphone 3gs made to work with att?
This iPhone 3gs was bought in Germany, unlocked, for T-Mobile service. It came unlocked special for overseas military. How can I get it to work for AT&T… I popped my AT&T sim card in, that's not working. I'm sure there's some setting I'm missing…
First I'd back up the pics, music, apps etc. Then I would system restore it(because those phones were meant for at&t). Try putting in your sim card Now. If it does not work you can Eaither unlock it for the USA or pay someone who will do it right.
There's no such thing as "unlocked for a specific carrier". Either it is still locked or it is unlocked. If it is unlocked, your AT&T SIM Card should work without a problem as T-Mobile DE and AT&T are fully compatible. It seems like your iPhone is locked to T-Mobile DE so either you ask them to unlock it (they can say "no") and pay their fees or you get it done yourself at one of the big online vendors like http://www.cellfservices.com/ as this should be significantly cheaper.
Look-up the IMEI at: http://www.iphonefort-mobile.com/ to double check the unlock.
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