This service is terrible and the and borders on fraud. There is all kinds of fine print everywhere in their website that is impossible to fully read without enormous effort before you enroll. Numerous calls from the US to my personal extra (PEN) number did not go through. In a two week trip to Greece and Israel I had to contact tech/customer support eight times. In the iPhone there is a profile that gets installed that shows you the remaining balance on the account. It was showing a balance of $25.55 (after starting with $30) when a business call I was on was disconnected because of insufficient funds. I was told I had to activate the additional $20, which I did, only to be told it was used up already when my call was disconnected, despite paying for $50.00 in data and voice service when I enrolled. I primarily used WhatsApp and I was using the OneSimCard voice VERY little during this trip. I still cant figure out what happened to the additional $20 that disappeared. I plan on disputing the entire charge with my credit card company.