Can I put a ATT sim card in an unlocked phone?

Contributor

Can I put a ATT sim card in an unlocked phone?

I found an unlocked iPhone that had a TMobile sim card in it.  Because of the passcode I can't get into the phone and because it is jailbroken, I can't seem to restore it to factory settings.

I have a working ATT iPhone and was going to try putting my sim card into this unlocked phone to see if it will allow me to do the restore.  I held off though not knowing if I would hurt something else.

My plan was to give this phone to my wife if I can get it up and running.

Will this sim card switch do me any good?

 

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Teacher

Re: Can I put a ATT sim card in an unlocked phone?

Nope. Restore the phone via ITunes and then your wife can use it.
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Contributor

Re: Can I put a ATT sim card in an unlocked phone?

That's the problem.. I do the whole "hold the power button and home button at the same time" exercise and the old phone goes to restore mode, but the restore keeps failing.

 

by the way both phones are an iPhone 3Gs

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Teacher

Re: Can I put a ATT sim card in an unlocked phone?

Make sure your iTunes is upgraded to 9.2. Delete the downloaded software upgrade located (on a iPhone at work so going by memory) c:\document an setting\username\application data\apple\ -- its somewhere in there. Redownload via iTunes and all should be good. It could be trying to install the upgrade for your current iPhone that might not be compatible with the iPhone you found.
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Teacher

Re: Can I put a ATT sim card in an unlocked phone?

Also make sure to Restart the computer and plug the iPhone in another USB port if it continues failing.
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