I just got a message on my Verizon iPad 3 that I've burned through 2GB of mobile data about 1 1/2 weeks into my billing cycle. The thing is, I don't think it's left my home in that period. I leave it connected to wifi at home and most of my data usage is streaming audio and some streaming video. Most of the time I'm using it less than 10ft from my wireless router so it can't be a signal strength issue and I never have this problem on my IP4. Is this a hardware defect? It would suck to have to constantly switch mobile data on and off.