Hello there.
Oh gosh, that's a long time to be having issues. Checking the area status is normally the first thing I'd recommend. There's also a coverage checker on there as well, might be worth checking the general coverage in the area too.
Network issues wouldn't normally persist for so long in most cases, so it's also worth considering that the device has an issue. You can test that by trying a different phone, or comparing your experience with another Three user.
If it's still unclear what's going on after that, I'd recommend speaking to the Support Team for further advice and options.
Pete.
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