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cos
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tried to upload new software

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Phone now says that sim card is no good, but was working until then.

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Matt Barnes

Please elaborate your question on what exactly happened and what exactly you were trying to do.

rab777hp,

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Spikey2
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if it was unlocked, and you were using a non at&t sim card - a software upgrade could have upgraded the baseband, and locked the phone to the official at&t sim card

I think you've hit it exactly.

Josh Calvetti,

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