easyGo that emphases international calling and messaging. In addition, easyGo ties with Airvoice for having the least expensive unlimited talk and text plan currently available from any AT&T based operator. $20/month buys you unlimited talk and text plus 100 MB of LTE data. Airvoice's $20/month unlimited talk and text plan also includes 100 MB of data but it's HSPA+, not LTE and is throttled to 128 Kbps after the first 50 MB.
The $20 plan also includes unlimited calling and texting to 11 countries; Canada, China. France, Hong Kong, Israel, Mexico, Portugal, Singapore, Thailand, United Kingdom and Venezuela; including to mobile phones in Canada, China, Hong Kong, Mexico, Singapore and Thailand. International direct dialing is supported. To call other countries easyGo offers $2 and $5 International cards. International credit never expires. Sample rates include Cuba 50¢/min, Laos 2.90¢/min, Haiti 17.8¢/min, Guatemala 10.2¢/min and Dominican Rep – 1.6
If you need more than 100 MB of data per month, easyGo offers additional data at the very attractive price of $10 for 1 GB. Best of all, unused data does not expire and rolls over for as long as the line is active.
H2O doesn't have the greatest reputation for customer support but other than that the $20 easyGo plan is an unbeatable value if you need unlmited talk and text plus reasonably price LTE data.
easyGo also has a $4.99/30 day Pay As You Go plan with rates of 5¢ per minute, text or MB of data. PayGo data is 3G rather than LTE but there's no extra charge for international calls and texts to 60+ countries.
SIMs are free for the $20 plan, $9.99 for pay as you go.