IF you can wait a month or so - maybe Yackie (
www.yackiemobile.com) will have their system running smoothly. They are a startup discussed in other threads here. They have roaming in 160 countries.
The system (making/recvg. calls and SMS) works fine now. (I have a Yackie SIM.) The support system, which is web based, (call history, recharging etc.) is not yet working. One advantage is you can choose a number that is local to much of where you are in the U.S. (Or get a UK or French number etc.
)
...mike
Make use of T-M's UMA/wifi free calling from any place in the world with access to wifi. I use an LG G6, wife an S7)
A/o Oct 20, 2013 no need for intl prepaid as T-Mobile U.S. includes voice roaming at 20¢/min (in and out)., unlimited text (in and out), and unlimited data in 140+ countries.
My Plan -[6 lines] U.S. T-Mobile unlimited minutes (incoming and outgoing), unlimited text, fast data on each line. that $145/mo. total! . (In U.S. no surcharge for calling a cell.) If a line exceeds 2G of data in a month, pay $10 more for that line. [That only happens a couple times/year.