EasyGO, the ATT MVNO that is owned by H2O Wireless, has just announced a new plan dubbed "easyGO Unlimited" that costs $20/month. The plan features unlimited talk, text and MMS as well as unlimited international talk to 11 countries ((Canada including mobile, China including mobile, France, Hong Kong including mobile, Israel, Portugal, Signapore including mobile, Thailand including mobile, Mexico including mobile, United Kingdom and Venezuela)) including Mexico mobile to mobile. Unlimited international SMS is also included as is 100 MB of 4G LTE data.
A data add on pack can be purchased for $10 to get an additional 1 GB of 4G LTE data, which brings the total cost of the plan to $30/month assuming that you need to refill your data every month. The data add on pack includes rollover and does not expire. International recharge cards costing $2 and $5 are also available which will allow you to call other countries not included with the plan at additional rates.
No word yet on what countries are included as part of the unlimited international SMS.
See BestMVNO's comparison of all EasyGO phone plans