Motherboard swap on s4
Hey, I just recently wanted to bring life back to my s4 phone. I swapped motherboards from a mobile with broken screen to one that has been water damaged but with a perfect screen. Everything about the phone works now except im not able to call anyone. Internet/wifi works fine but im not able to make a call. I have contacted many different phone providers to check if the imei is locked but it is not. Can someone help me?
Is this a good question?