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[Q] phone wont connect to network (outside US)

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Default [Q] phone wont connect to network (outside US)

in a first moment, the carrier signal was ok, but data wasn't working. so i called the carrier, get the correct APN, and the everything was fine for 5 minutes, for phone calls, data network. But suddenly signal was lost, and never got back. Factory reset, the signal bars still off, with an X. Tried to locate the carrier manually, but it doenst work. What can I do now? I will try another sim card to check if it works. How do i know the phone is carrier locked?
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If its the AT&T version (presumably, since this is the AT&T variant section) it should carrier locked, unless you obtained the unlock code; or otherwise purchased it SIM unlocked from a 3rd party vendor.

On the other hand, if you were able to connect to the network at all, it is probably not carrier locked. Likewise, if it was locked, it would ask for the code when you inserted the SIM.

I think something else is going on. Even if it as SIM locked or bad SIM, I believe it should still read the network as being present. It would just not let you connect to the network.

Although, replacing the SIM is an easy and cheap thing to try. At least to eliminate it as the issue.
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