I'm almost over my data plan on my iPhone 4s

I have att&t and i have 3GB of data a month. I have used 2, 986mb of 3, 072mb and if i go over my parents will kill me! I have gone to settings and then turned off my cellular data, will that stop all data! I've been using Wi-Fi but from my understanding that should be free and not cost me a penny. It seems like my data has been used though because i could of sworn it was at 2879mb yesterday and i had cellular data turned off! Any help please!

Only thing you can do is put your phone on airplane mode

Do you use iMessage when you're not connected to a Wi-Fi network? If so, that'll use your data. It costs $15 per GB of extra data, you can always offer to pay your parents back for it.

Use the Wi-Fi at home and don't use imessage unless its on Wi-Fi

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