Ls980 unable to establish internet connection

I have one ls980 which was only getting gsm data network not getting 3g data internet
So i "repair nvm","repair security" initial phone imei has 99***** but after "repair security" phone’s imei was changed to 352******02 and
and know not getting internet data voice signal was ok but no 2g internet no 3g
On status bar
There is a warning "Unable to establish an internet connection"
After that i repair original imei but no success no internet by sim
Please help

Shahzaib Jahangir