I have a Verizon samsung J3 and used the J3 embedded email app. It's set to use WI-fi if available.
I never use much cell data, less than .5 GB, and am usually in a WiFi. I am a light email and app user.
All the sudden, the email app started using data, both cell and wi-fi. It used 2 GB of cell in two days, and another 2 GB wifi.
I turned off mobile data, and stopped the sync on the email app.
My email accounts on the server look ok. I don't see anything odd in the sent catagory
Could this be a virus I got in a attachment, or a bad app hijacking my email?