How do I change my public Mobile service from an old cell phone to a new one?
Your service on Public Mobile is SIM based and you just need to put your active public mobile sim to any unlocked phone. The service is not based dependant on your specific phone. Ensure that you check that your new phone supports the cellular bands with Public Mobile. You can also just test this by switching your SIM to your new phone. You will have to adjust the APN correctly to access data. There are other threads with this information on how to correctly set up the APNs for your phone type (Apple, Android),