LG G flex D958 network problem...

LG G flex D958 network problem...

History of fault
Customer came to me said after software reinstalling from LG sim not detected. As he guess its a software matter..

Real condition
I insert sim and checked it. After insert sim it shows "emergency calls only". But sometime got "no service". After few min shows network name and came few signal bars. But I couldn't make call. But that signal bars only for few min and again it's showing "emergency calls" and "no service" time to time...

I can see some damages as a proof it disassemble before somewhere....

I wanna know...

1. As a experience and look like is it software matter or hardware matter? Because time to time changing its condition as i explained.

2. If software how to fix it step by step....?

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LG G flex D958 network problem...