We use the $45 per month AT&T plan. We get unlimited calls and texts, but we also get 3gb of high speed data (unlimited lower speed data). We also have the ability to roll over our unused high speed data from the previous month (1 month rollover only & it expires after one month). It only works when you renew the phone plan before it expires. We rarely do this since the phone plan only covers 30 days and there are many months that have 31 days in them. We can get a discount for multiple lines and a discount for setting it up for automatic payments. We are waiting to change it over to the multiple line discount after our vacation so that we don't lose our rollover data because I figure we will need it while on the drive down there.