[AC Question]

Hello
normally my Korean galaxy is official releases since I tried it with both operator and it works (calls and internet and everything )but with the third operator there is a problem, sometimes it works and makes normal calls and sometimes it can not make calls or receive them knowing that the network signal is still good

[B. Diddy]

Welcome to Android Central! Have you spoken to your carrier? When you say "Korean Galaxy," is it a genuine Samsung Galaxy phone, or is it a Korean knockoff? If it's a knockoff, it's hard to say what kind of hardware or firmware issue might be causing your problem.