Well, I don't think there's any problem with the buying of device over mexico. I think the problem is with the settings, firstly make sure that you can make or receive calls over your device or not ? If yes then I would say try calling your service provider seeking the AccessPoint settings you can head over to the Settings>Under Wireless and Network tap more settings>Mobile Network>AccessPoint Names. You can use it to create and configure the access point on your own I am sure if your service provider will feed you the settings you are looking for, just try telling then that you want to configure the APN settings manually over you P6.
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