Android or iPhone?
Make sure old provider sim is removed, and PM sim is enabled and set as Primary. Perform a Reset Network Settings after a device reboot. Test again
If issue persists, try re-register iMessage or RCS
iPhone: Manually remove phone number from Settings > Phone > My Number. Wait 5 minutes and reboot phone and go back to the same Setting menu and re-enter phone number to re-register iMessage
Android: Uninstall Google Message. Wait 5 minutes and Reinstall Google Message and re-register RCS
If the above steps do not help, open ticket with PM support and ask them to re-provision your a m/account. Please open ticket using Public Mobile Expert Messaging , Select Start a Chat to begin (You will need to use your current Community account to login to submit the ticket):
https://expert-messaging.publicmobile.ca/guest/pre-chat
**You'll get email/sms alert when agent replies. or monitor here: https://expert-messaging.publicmobile.ca/message-centre
