Hi. We use this provider internally and for a customer who makes a lot of calls out of europe to save money. The biggest disadvantage is that you cannot enable automatic refill via credit card (pre-pay provider) until you have not made two refills via Bank Account. This due to security reasons. The second disatvantage ist, you have to double-check the prices. Every month, they release a new pricelist and for us in Switzerland, the call-price for Switzerland Mobile was around 8-9 Cents per minute and on one day was raised to 35 Cents per minute.