Here’s something I put together for a local group after several folks wondered why their iThings were eating their data despite their not them for more that the odd text or quick phone call when out and about.
Things to disable in Settings:
iCloud :
Back Up Over Mobile Data : OFF
Mobile Service :
- Ensure only Apps you use when out and about are allowed to use Mobile Data
- Wi-Fi Assist - OFF
- iCloud Drive - OFF
- iCloud Backup - OFF
General:
Background App Refresh : Wi-Fi or Off depending on whether you mind the slightly battery drain from active Apps refreshing data from their server periodically.
Photos:
Mobile Data : OFF