Their plain is typically $ 29/mo, but a multi-month discount is available to first time userswho prepay the first year of service.

– Unlimited Talk to USA and 55 Countries
– Unlimited Global Text
– $ 2.50 Call Anywhere Credit
– 1GB 4G LTE Data

This requires an unlocked cell phone, with decent T-Mobile coverage area.
I’ve used Ultra.Me for 3 months, and I’m happy paying ~$ 30 for 1GB 4G, and an occasional $ 10/GB upsell.

The main issue is because they’re a reseller, there is some manual effort involved to get data working.
They’ve improved this by allowing you to send a signal to your phone here.