I'd also like to second Mint Mobile. I prepaid $380 for 12 months of unlimited data. Mint is an MVNO meaning it uses T-Mobile's network but you are second tier priority behind T-Mobile users, so speeds on Mint can drop if there are too many people in the area. I have never once experienced this, and have used Mint for 4 years.

I mean $32/mo (after taxes and fees) for unlimited data is a steal. I consistently get 200+ Mbps speeds.

I also buy my phones outright instead of financing. But it still works out to cheaper and more flexible than getting a 2 year contract with the likes of Verizon, Tmo, or ATT.