Quote Originally Posted by mohdumer View Post
Senter: My Sim Is Perfectly Alright Since After I Have Reverted Back To k790 Everything Is Fine. Dont Ask Stupid Questions. I Have Stated Everything In Post.

Heallvy: Ya Thats True That K818 Is For China Market But Its Not Branded So It Will Work Outside China.
As justme said there might be something with the frequencies, China has other frequencies and maybe this is somehow reflected in the firmware, that might be the reason why your phone is working as K790 and not working as a K818, I think there is an incompatibility between the firmware, SIM and the frequencies of the provider/network.