My Samsung S20 recently updated and used all my data allowance. When I checked it is definitely set to only update with a wi-fi connection. Any ideas how this happened?
The phone has the ability to change from one connection to the other if the phone deems one connection is more stable.
The only way to stop this is to turn Off Mobile Data in the phone's settings.
Current Phone ~
Samsung Note 20 Ultra 5G SM-N9860_256Gb SnapDragon 865+
Samsung One Ui 3.1/ Android 11.