What iPhone plan are you on and how much is it?

Trying to find the best cheap plan.

Virgin Mobile USA: offers unlimited data, texting and 300 calling minutes for $35.00, although the data is 2.5 GB at 4G and the rest at 3G

T-Mobile: Offers unlimited data, unlimited text and talk for $50.00, although only 1GB of data at 4G LTE and the rest at 3G, but you can get unlimited LET for $80.00

MetroPCS: offers unlimited data, talk and text for $40 a month, but only 500mb of data at 4G LTE

Sprint: Unlimited everything at 4G HSPA for $110 a month!

There are other small carriers like Net 10 which offer the same things as Metro PCS

Cheapest iPhone will be a month-to-month like Straight Talk, Virgin, Boost or something. The downside, you'll pay for the whole phone price up front. But the plans will be $50 or so. Best luck.
http://www.virginmobileusa.com/iphone/

Koodo. It's like 25$ per month for unlimited data.

Sprint - unlimited data

T Mobile $30 plan
It has unlimited Text and Data (5GB of 4G speed)
With 100 minutes