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Ppwer off your device fully and leave it off for 5 minutes to allow it to refresh on the network. While you are waiting for that 5 minutes to pass, remove your SIM, clean the metal with a bit of rubbing alcohol, dry it, and pop that back in your device before booting it back up.
If you are still unable to connect to the betwork, try manually selecting the network. Check your APN settings as well. Is your device a T-Mobile firmware Note 9? If it isn't. What is the model of the device? N960U, N960N, N9600, N960DS, or something else?