Hey there! I highly recommend taking a few steps to deduce whether this is a hardware or service-related issue. You should try making a call to someone with an app that isn't your actual phone dialer (eg. Skype, Messenger, FaceTime) just to test and ...
Hey! I remember running into that exact issue myself when setting up my own SIM. I believe you can just give it a bit as the SIM takes an hour or two to properly activate itself. Usually, it will work out. If you don't end up having service, you shou...