1) First, be sure to try restarting your watch at least 2-3 times after purchasing and activating a COSMO Mobile service plan (you may need to wait a minute in between restarts). Multiple restarts can sometimes be required to establish a successful cellular connection after activation.
2) Check out our helpful connection troubleshooting guide HERE.
3) If you continue to experience issues, please reach out to our Support team at support@cosmotogether.com