Hello, We understand how frustrating it is to not be able to use your mobile services, such as calls, text, and data, when you want to. Here are some troubleshooting steps you can try to get the phone working again for those calls. https://www.samsung.com/us/support/troubleshooting/TSG01001613/
If the troubleshooting is not helpful, you will need to follow up with your service provider for additional troubleshooting steps, as they are responsible for these services.
