My iPhone 12 max pro is having issues with certain apps without WiFi (Facebook messenger, what’s app to name a few).

Hello Leroybiggs,

It sounds like you are having trouble using some app when not connected to Wi-Fi.

Here are resource that might help.

• Check out View or change cellular settings on iPhone.
  • Ensure that your cellular data is turned on in Settings > Cellular.
  • Ensure that the apps in question are turned on to use cellular data in Settings > Cellular > [App Name].
  • If this happens when you are using Low Power Mode, turn off Settings > Cellular > Cellular Data Options > Low Power Mode.
• Install any carrier settings updates as this relates to your cellular service: Update your carrier settings on your iPhone or iPad.
• Restart your iPhone.
• If you have any third-party security software or VPN, disable it to isolate as it could affect the way your network works.

Hope this information helps.

Have a good day.