I was traveling to Switzerland for the first time and quite frankly was confused about which International sim card to use or shd I use one also not! But when i reached the airport i found the martix kiosk and the sales guys there explained everything in detail and really cleared all my doubt! Must say it was a very wise choice as not only was it cheaper in comparison to others but also they were very helpful. Advise everyone to use it when they travel, you wont be disappointed!!