HTC M7 issues

[AC Question]

my m7 is version 5.0 i need an urgent help my HTC M7 doesnt work on 2g/3gb nor 3g when i ever i change my network mode to 2g its shows the edge and i can browse with it but when ever i change to 3gb all the network bars goes off and shows xthe i have to change it to edge and manage it like that can anybody help me pls or is it a firm ware problem.

 

[belodion]

Has it ever worked on 3G? Are you sure that there is a 3G signal in your area?