I have the exact same problem. I can't connect to 3G and I can't use the store, but I can use Wifi to browse the internet. My unit is also no longer registered after the Amazon customer rep asked me to do a "Reset to Factory Defaults". According to Amazon, this unit is now defect and must be replaced, but I just don't buy it. Feels like there something wrong at their end, but according to at least two people I spoke to, my device is not blacklisted or anything similar..
I used to be able to view different network providers, using Alt+e, Alt+q, Alt+q from the settings screen but this no longer works.
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