Could not activate mobile data network - iPhone 3GS
Last week I started to get this message everytime I tried to use internet services, email, web or apps. I was on 4.1.2 and the phone was officially unlocked and running a T-Mobile sim with auto-update carrier file installed.
I reset the phone, restored it and never worked, subsequently, I have done this many times, reset network settings, hard reset, soft reset and I eventually upgraded to 4.2.1. This still never solved the issue.
After countless restores and resets and iTunes updating the carrier files, nothing is working. I contacted T-Mobile who said there are no connectivity issues, must be the handset. I then contacted Apple who advised the handset is out of warranty and an 'out of warranty' repair will cost minimum £146.
The phone works fine calling, messages and on Wi-Fi it's only internet services that do not work. Is there anything else I can try or has anybody experienced the same problems?
iPhone 3GS - 4.1.2 & 4.2.1, iOS 4