Best practice international GSM setup

[Bossman]

Forget all the 3rd party stuff. Comparing receiving and making calls directly on the sim, there are better options than onesimcard. Calling out with onesimcard is about $1 or more from the countries I am likely to visit. Couple that with the insanely high rates most charge to call the +372 number, it certainly makes no sense for my travel needs. If it works for you, so be it!