i'm on a pay as you use mobile plan, and since wireless use doesn't count, i've never used more than the minimum tier 100mb a month (which is $3). sms and talk minutes have their own separate tiers. just depends how you use the stuff. if you're out and about with no wireless to connect to most of the time, it might be the same or even more than certain other fixed plans. otherwise, feels good to pay less for using less.