I was going to USA for the first time in my life was quite frankly confused about which International sim card to use! 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 is it cheaper, price wise, to others but also they are very helpful. Really appreaciate the brand and advise everyone to use it when they travel.