I am regularily tethering from my phone to my iPad. Basically this works fine -- except that, being on wifi, the iPad or various apps treat the data connection as if it was a flatrate. The same would probably apply when being in places, that apply a narrow data usage limit to their connections.
Is there some way to tell and iPad (mini) to consider certain Wifi networks as mobile data connection?
Update: I strongly prefer non-jailbreak solutions. if you know a jailbreak-only solution, please still state it for completeness, but I probably will not use it.