I’ve had my plan for around 3 months and the first two months everything was fine but the third month, even though my cellular data is tuned off, when I check it there is around 100MB less. Even when I’m not using it, there are ridiculous amounts that are used. I don’t understand why this is happening.
Welcome to the community!
What is the make and model of the phone you are using?
How do you turn off the data on your phone?
Where are you checking to see that data has been used?