Hello ​@Megan0408 

Thank you for getting in touch. 

We are very sorry to hear you are experiencing issues with iMessage and Facetime. 

Can you please confirm if you have tried the below steps?

1) Turn off iMessage (Settings > Apps > Messages)

2) Restart your phone (by pressing and holding the on/off button)

3) Tap Settings > Apps > Phone > My Number and confirm that it is correct.

4) If it is not correct, please enter the correct number

5) Turn iMessage back to On (Settings > Messages)

6) Finally, go to Settings > Messages > Send & Receive and see if the correct number is displayed under "Start new conversations from:"

If you are having issues with step 4 please reset network settings and try again. Settings > General > Transfer or Reset [Device] > Reset > Reset Network Settings.

Thanks 

Natalie 

Hi the above has not worked and I am still experiencing issues after trying all the steps above?

Hi ​@Megan0408 

 As you have one phone that works with the iD SIm and one that doesn’t….

It may be worth going through all of the settings on your iPhone 13 pro max (that works) and comparing them against those on your  iPhone 16 pro max to see if there are any differences that is affecting its use.
Taking the time to do this may determine the problem and it may just turn out to be something simple but necessary for the SIM to work.
Good luck x
 

Hey there ​@Megan0408, it may be worth trying a free replacmeent SIM card. Please have a look below on how to get one:

Thanks,

Tyler