19-05-202205:47 AM - last edited 19-05-202205:47 AM
Have a look in your data usage page to see how much your phone is showing as being used @bugsey
Also your network can tell you how much as been used but can't usually advise on what.
Turning off Mobile Data in the phone's settings can stop unwanted usage as some phone's can switch from Wi-Fi to mobile data usage if connection quality drops. There are settings in the phone to stop this too.