Hi
Check that you have followed the instructions here:
- Set up and use cellular on Apple Watch Series 3 (GPS + Cellular) - Apple Support
- Use Apple Watch with a cellular network—Apple Watch Series 3 (GPS + Cellular) only
If you still need help, then I suggest that, in the first instance, you contact your carrier for assistance with using the built-in cellular feature.
If the issue persists, then, depending on your carrier's advice, I suggest that you next contact Apple Support (remote diagnostics and/or mail-in service may be available, if required), make a Genius Bar reservation or visit an Apple Authorised Service Provider for assistance: