AT&T used to work this way, but it doesn't anymore. At least not on the no-contract plans. It isn't cheap by any means, but it is cheaper if you bring your own phone. I currently pay $150 for two lines with 15GB shared data. Once my 1520 is paid off next week, my bill will drop to $120 a month.EDIT: This price isn't what a new customer would get. I get a $15/month employer discount and AT&T upgraded me from 10gb to 15gb for free last month. So I'm only paying the 10gb price, but getting 15gb. I'm not sure why, but I'm not questioning it until they try to start charging me for it.