When this sim is not provisioned mm2 messages are visible on your phone. This simply means that your sim card provider has not activated your card or it has deactivated because of non payment options or other account issues so, lets see some solution by which you can fix sim not provisioned mm2.
Call your service provider or customer support and get updated about the status of your account and activation process.
If in case your account is active right, but the sim card has not been activated, then you can contact your sim carrier to activate it online.
Lets see some steps:
Because of many payment and account issues your account has been deactivated, share this with your service providers to resolve it.
If the sim card is not working properly or not suitable for your phone, then it may be required to change the sim card. In that situation contact your provider for assisting the solution.
If every issue has been resolved or assisted by your carrier then you can check that your sim card is working properly or not. Then restart your device to check that issue has been resolved or not.