[HELP] Network Issue on Samsung Galaxy Tab 2 P3100, SIM not working

Hey Guys,

I had brought this TAB from a friend with a confusing SIM or Network issue. Actually this Tab wont detect any CARRIER other than TATA DOCOMO. I am sure that it has no network lock. Not only this, even on TATA DOCOMO it's sometimes loosing network, when I got a call or while using Internet.
I have searched on XDA and found no thread regarding this issue. But some where I read that flashing latest firmware via Odin may overcome the particular SIM issue. I am just afraid, if I flash the whole firmware, It may be possible that even TATA DOCOMO wont work, then this tab is use less for me as I have no wifi around me.

It cant be a hardware issue, if it is then no CARRIER should work. I really dont want to visit Samsung care ATM, as I am short on money & this TAB is out of warranty.

Any kind of help is appreciated.

THANKS IN ADVANCE.

Here are the detail of my Tab 2.

Model No.- GT-P3100 (16GB)
Android Version- 4.1.2 (No 4.2.2 Update after that)
Baseband Version- P3100DDCLK1
Build No.- JZO54K.P3100DDCNA3
Country- India
Root Status- Never Rooted

On dialing *#1234#
AP: P3100DDCNA3
CP: P3100DDCLK1
CSC: P3100DDCNB1

Is there anybody to help me in solving my problem? ?