Dear all,
I bought a CECT Q638 (MT6227) dual sim mobile phone from CHİNA. Both sim cards were running in China,When I am back to my home country,sim A is running but sim B is not. Sim B is giving the message 'invalid sim'.
So I need to solve this problem in order to use both sim cards at the same time. But the user's manual is in Chinese.
I am looking for a English user's manual if anyone has?
Please help