Android - These devices are essentially internet dependant thus the owner of the device consumes large quantities of data, giving the device a massive hidden cost.
BULLTWANG

I have a Samsung Galaxy Tab 10'1 and it is not dependent on the net for anything. I use it offline most of the time and I hardly even have a SIM card in it. The little ads imbedded in the software is fine, it doesn't get in the way and it doesn't distract from what you are trying to do.