SIMPLE Mobile
Subsidiary of TracFone Wireless/América Móvil.
They are now offering 4G plans with a decent amount of data, and seem to be upfront about throttling (they used to call their plans "unlimited" data).
Smartphone plan overview
SIMPLE Mobile operates on the GSM 1900 and UMTS 1700/2100 bands and is compatible with T-Mobile.
The best smartphone plan that we've located is the $50 Unlimited plan:
- 3 GB data cap
- Unlimited minutes
- Unlimited text messages