What is the best and cheapest iPhone 5 plan?

Who is the best carrier with the best and cheapest plans? All i need is unlimited texting and good internet.talk time is the last thing i need.

Added (1). I live in iowa

Sprint its the cheapest and unlimited but its so slow.
Verizon and att its faster but they don't have unlimited internet

You didn't mention where you live. If you are in Ontario canada. Fido would be a good option since they bill by seconds. But if you compare the cost of service with new companies like wind mobile etc. They are cheap. Horrible coverage though. So you gotta decide what you want. Cheers.