Huawei Ascend G525 — Can't make or recieve calls though 4g works fine

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May 9, 2016 3:33:26 PM via Website

Hey, my name is Chris, i'm from Greece and I recently got a Huawei p8 lite ale l21 and i can't make or receive any calls. When I trying call someone i get a "mobile network not available". In dual sim setting i can see my sim working in slot 1 and i have full signal and 4G perfectly working all the time. Also slot 2 is totally useless as when i tried to place my sim there i did not have even signal.
I have searched around the web a little bit but i have not find something really helpful. Any ideas?
It will be helpful to change my ROM to a custom?My current version is C432B170. That was the first thing that i thought but i m not very familiar with that kind of stuff