I have an iPhone and I'm with Vfone. Recently I was woken up at 4am by a VF text message warning me I had just 50MB of data left. The phone was red hot. It seems the youtube clip I was watching apparently [I still don't know], carried on playing [perhaps - dunno], after I'd finished watching it and put the phone down; then went to sleep. The app was still running in the background a, although I had closed yTube, it runs in the 'tray' with other apps that need the double HOme button tap and then hit the X to fully close. Hope you followed that....

I have wireless coverage throughout the house but somehow the phone switched to 3G [wirelsss still working throughout the night], and so data was being sucked dry - exactly what was happening/running I don't understand.

Anyway, annoyed at losing all my data plan in just a few hours, on speaking with VF they advised that every time, day or night, I am not using data I should turn it off. This means going through: settings / general / cellular / cellular data -> turn this off/on - each and every time I want to browse/email/maps/etc.

This is a function I've never had to do in the 4or5 years I've had an iphone.

Does anyone go through this scenario [turning data on/off]  each day?