Disable turning off mobile data when my iPhone 12 Pro is locked.

Hi Phirah,

Thanks for reaching out using Apple Support Communities. Here to help.

We'd like a bit more clarity abut what is happening and what behavior you are seeing and would expect to see?

There is not a cellular data setting that is based on the lock status of the iPhone.

You can manage your cellular data settings in Setting > Cellular. This includes toggles for specifically what apps are allowed to use your cellular data. You can read more about the cellular data settings on the iPhone at the link below.

View or change cellular data settings on iPhone

Hope this helps! Feel free to reply with further detail and we will try to assist!