i'm writing on behalf of a friend who is owner of a rooted HTC One M7.
He has an issue with not being able to get more than an EDGE connection. WCDMA / HSDPA / 3G is not available at any time.
We tried to change radios/basebands, upgraded to latest 4.4 KitKat Viper, but no success.
The issue is not provider/sim card related, it works fine in other smartphones.
Any ideas ?