Steps to resolving call issues:

1. Check to ensure that your wireless device and network signal indicator are properly configured.
2. Check to ensure that you have enough network coverage to make or receive a call.
3. Verify that you have are correctly subscribed to network and roaming services.
4. Check if any restrictions or filters are blocking calls.
5. Restart your device.
6. Ensure that your device is up-to-date with the latest version.