My iPhone 4 is using my cellular data even though its connected to Wi-Fi?

The Wi-Fi is working for everything else and still works now that I've turned my cellular data off. It used about 0.75 gigs when it should've been using the Wi-Fi. Please help. Does anyone know why it's done this or how I can stop it from doing it in the future?

I'm not sure, but you should just call you phone provikers customer service number. Not to be rude, but they are there to help you with things like this.

I called T-mobile like once a week for a month before I got an android smartphone.

If cellular is turned off (meaning off in the settings) and your phone company shows usage, then call them… That can't happen.

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