Switching Phone and Sim Invalid MMI Code

[Michael Spector]

I have a Samsung Galaxy 8+. I have a home in a rural area with no ATT service. I did not buy the Samsung from ATT so I do not have wi-fi calling. ATT gave me an Iphone 7 to retain me as a customer (for an additional 2 year commitment). My thought being that I would switch the sim card to the Iphone and use wi-fi calling, and switch back to my Samsung when I am not at the vacation home. These plan nearly worked except I have an issue with ATT visual voicemail and other visual voicemail apps because it is reading an invalid MMI code. I prefer visual voicemail to calling because I get a ton of voicemails and I like to see who they are from rather than listening to each one

I am sure the issue is that the IMEI is not registered with ATT for Visual Voicemail. Is there a potential workaround to solve this so I can get my visual voicemail on my Galaxy?

 

[Anya Baker]

The issue with the invalid MMI code on your Samsung Galaxy 8+ after switching the SIM card from an iPhone 7 may be related to the settings on your phone or the configuration of your carrier's network. Here are some steps you can try to resolve the issue:

1. Update the APN settings: Access the APN settings on your phone and verify that the correct settings are configured for your carrier. You may need to contact your carrier for the correct APN settings.
   
   
2. Verify the SIM card: Make sure the SIM card is properly installed and not damaged. If necessary, try using a different SIM card to see if that resolves the issue.
   
   
3. Restart the phone: Sometimes restarting the phone can resolve issues with MMI codes. Simply turn off your Samsung Galaxy 8+ and turn it back on.
   
   
4. Check for software updates: Make sure your phone's software is up to date by going to Settings > Software update. If an update is available, install it and check if that resolves the issue.
   
   
5. Contact carrier support: If the issue persists, contact your carrier's support team for further assistance. They may need to make changes to your account or network configuration to resolve the issue.
   

If these steps don't resolve the issue, you may need to contact Samsung support for further assistance.