My Verizon contract is going to expire in a month so I'm finally going to start using my iPhone as a phone.  Anyways, I was wondering if anyone knew of a cheap data plan so I can get unlimited internet and e-mail with a prepaid sim card.  I don't use enough minutes to justify a regular plan like those from T-Mobile, so T-Zones doesn't seem to be an option.  Any other providers out there that have anything decent or anything I'm missing about what T-mobile has to offer for prepaid+cheap data plan? (less than $20/month)