[Q] HTC ONE errors

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By messi121, Junior Member on 5th June 2014, 11:16 PM
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My HTC One phone is coming up with different sorts of errors. Never been rooted or anything and a factory reset has not helped either. It was working fine previously.

Now when i try to dial out i get the error message:

Connection problem or invalid MMI code.

I also notice that it says USSD code running when i dial a number at times.

There is also a small message that says out of service area when trying to dial numbers.
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