Got a Dialog U-Sim but 4G is still not working? Then you came to the right Place.
Most of the people have experienced this cause. It’s because the phones default firmware doesn’t support Sri Lankan Dialog 4G. To get it back to working condition first you have to insert the new Dialog 4G enabled U-Sim. Then connect the iPhone to the PC and run iTunes.Then an update will appear, select update and it will simply enable 4G within few seconds. Enjoy!
*Note-4G only works in places with 4G coverage*