What are the possible data plans to get for an iphone?

I'm already on a plan with my parents i just want to upgrade to the iphone or a smart phone. I have verizon and i'm basically looking for the cheapest data plan possible

Cheap means not much data. All carriers have different plans, when I got a data plan on my smart phone it was 20.00 for 200mb (not much). Then I added my new tablet 200mb another 20.00 a month. Now we have just lumped everything with one data plan and 1000mb. We have ATT. 3 smart phones and 2 tablets.

The cheapest would be a prepaid provider like Virgin Mobile, Net10 or Straight Talk.