Wth? then why would you use wifi anyways if you are "claiming you get charged"... Why waste your own bandwidth if you are going to get charged anyways...
Anyways bottom line is YOU DON'T GET CHARGED FOR WIFI!!!
IT'S FREE... THEN WHY ELSE WOULD THERE BE SO MANY PPL AT STARBUCKS
You can call your service provider to block data... then u can turn on wifi in a hotspot and browse on phone.