Have low package deal . Got a extremely high bill after a month .saying I used a lot of data/internet . I am a low user . Never downloaded anything .shouls have been £9 for usage now £115 . This is for a month .i check emails .use what's app and text occasionally
dont understand .someone thinks smart switch downloaded all my old photos in one day
Set a spending cap on your online account. £3 should be plenty enough. Or £0 if you want no out of plan spends.
Then you need to check billing &/or recent usage to see where the charges have come from. It won't state individual apps (would have to check your phone apps in settings to see individual app data usage).
I believe you can set apps to not use mobile data, so just download when you are on WiFi.