Apple ID Services using too much data

Hello Belepix.

Thank you for using Apple Support Communities. If you're noticing high cellular data usage, you can should check and make changes to what is accessing your cellular data. It does sound like you've done a great job in doing that. Just in case, here are more resources and steps that should help out: View or change cellular data settings on iPhone - Apple Support

Navigate to Settings > Cellular and scroll down to edit which apps and services have access to your cellular data. Additional options can be listed under Settings > Cellular > Cellular Data Options:

Reduce cellular usage: Turn on Low Data Mode, or tap Data Mode, then choose Low Data Mode. This mode pauses automatic updates and background tasks when iPhone isn’t connected to Wi-Fi.

Turn Data Roaming on or off: Data Roaming permits internet access over a cellular data network when you’re in a region not covered by your carrier’s network. When you’re traveling, you can turn off Data Roaming to avoid roaming charges.

Additional steps you can try is to install any pending updates that might be available for your device. Keeping your device fully updated can help resolve various issues. Just in case, the following resource can guide you through the update process: Update your iPhone or iPad - Apple Support

We hope this information is helpful. Cheers.

Belepix,

We are glad we were able to help.

Don't hesitate to reach back out if the issue persists.

Good Luck!