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Help Sim Not Allowed message

So I live in Thailand using my unlocked AT&T Atrix I got a couple months ago. It's been great and I've had no issues with it.

Now out of no where after the battery died, got home, plugged it back in and powered it back on, I'm getting a Sim Not Allowed message.

I did a factory reset to no avail, so I haven't a clue what is going on here. I thought it might be something wrong with the sim, but its working fine in other phones (tried in a BB Bold 2 and Desire HD).

Sometimes I can get it to connect to the network and usable for about 10 minutes, but then it drops out with no more service. No idea whats going on here. Any idea on my next step for trouble shooting?

Thanks!
 
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