I mostly use my iPad out and about (cafes, on the train, etc). I currently pay £10 on a month whenever I use 3G with O2 (which is every month pretty much). I am thinking of not paying the extra £100 for 3G and rather than paying £10 a month instead pay a few pounds extra a month on the new O2 iPhone tariffs to have a 1GB data account which can be used for hotspotting. The other thing I won't have unless I tether is GPS built into the iPad. Has anyone done a similar switch and if so how have you got on? What is the iPhone hotspot battery like?