Phone trouble

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Hello. I updated to IOS 7 last week and my phone went back to its locked carier. Well, let me give you some background on the problem. I brought a phone, IPhone 4s from sprint last year. The bill got to be too much, So I had sprint turn my service off. I flashed my phone to T-Mobile, but wasn;t satisfied with them. I then asked Att if I could get a sim card from them and nuse my phone. they said yes. Now the problem comes in. I downloaded IOS 7 and now my phone is not working. It keeps saying that it is on the Sprint network, but I have an ATT sim card inside the phone. Does anyone know what happened? Do I have to unlock the phone to get it working again? Please help.

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Submitted by Isaac Hebert (not verified) on Monday, September 23, 2013

You probably have to unlock the phone again to fix this problem.

Submitted by Kierra Davis on Monday, September 23, 2013

From what I can understand, flashing and unlocking are two different things. But, if I can unlock the phone; do you know a way?