Recently bought a Galaxy S2 I9100G and I have this issue where my phone loses network (both digi and data) even when my signal bar is full.

I can't *126# / *128# / send message and etc.

Googled and search everywhere for solutions and I have even went to Digi to change my simcard.

Anyone have any idea why is this happening?

Well I'm in Penang, I've did factory reset 3 times already.

And today i was driving around Penang Island and my phone kept on dropping to 0 signal and also at full signal, the phone was indicating the ! sign and no network / service. Changed simcard already.

Tested with Maxis simcard, signal bar and strength on the phone is constant with my Digi yet i did not drop my network connection. I think it would be safe to say i can leave out faulty phone as the cause?

Any ideas?