This can happen, and its completely normal.
This error is easy to fix, but what does this mean, and why it appears?
What Does SIM Not Provisioned MM2 Mean?

This is a common error, especially among those who buy a new smartphone or a SIM card.
Usually, the error only affects users who register a new SIM Card.
Some other reasons may include:
How do I fix the SIM Not Provisioned MM2 issue notification?

Once done, start your smartphone.
Toggle On/Off Airplane Mode
Enabling Airplane mode turns off all cellular connection connections.
Once enabled, wait for a few seconds and disable Airplane Mode.

An outdated Carrier services app sometimes causes the error.
Hence, you better update the Google App.
- kick off the Google Play Store and tap on yourprofile picture.

From the list of options that appears, selectManage apps and devices
3.
Now select theUpdates Availablesection.
Now, find theCarrier Servicesapp andinstall the update.

However, in some regions, it may take a few days.
you could contact your Carrier or web connection Provider from any other number to enquire about the activation status.
You must check for physical damage even if your SIM card is correctly seated.

The problem may even reside in your SIM card slot.
you might switch off your smartphone and eject the SIM card.
After ejecting it, insert it again and turn on your smartphone.

After the restart, wait for the cellular internet to appear and then make a run at make calls.
If the other slot is already occupied, then swap the SIM cards.
Trying another slot will help you rule out problems related to the SIM card slot on your smartphone.

Tell them the things you have tried to deal with the SIM Not Provisioned MM2 error.
They will help you to deal with the issue.
If its a online grid-related problem, it will be fixed within a few days.

you could get a new SIM Card for your old phone number through MNP.
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