iMessage free if you text between iPhone s using AT

imessage uses wi-fi or 3g ( from your plan allowance) if wi-fi is not available.

imessage uses wi-fi or 3g ( from your plan allowance) if wi-fi is not available.

It would be hard to imagine breaking your data plan with iMessage, unless you are passing some massive attachments.

On the other hand, iHeart radio is like Pandora, I think, and streams the music constantly while running. I wonder what happens if your wi-fi drops for a second while you are running that. Will your phone jump over to the cellular connection to keep the app running? If it does, that could easily explain the data overage.

You might want to play around with disabling cellular data when you know you will be parked under wifi for a while.That way, if wifi does blip on you, you don't start munching on your data plan.

It would be hard to imagine breaking your data plan with iMessage, unless you are passing some massive attachments.

On the other hand, iHeart radio is like Pandora, I think, and streams the music constantly while running. I wonder what happens if your wi-fi drops for a second while you are running that. Will your phone jump over to the cellular connection to keep the app running? If it does, that could easily explain the data overage.

You might want to play around with disabling cellular data when you know you will be parked under wifi for a while.That way, if wifi does blip on you, you don't start munching on your data plan.