In general, the best Global Sim cards work worldwide, enabling you to text, surf, and call other people from any corner of the globe. The best card, the Samsung KNOX (Global Network Exchange), is hands down the most popular card in the industry. The biggest benefits of this card include unlimited local and global calling, free talk time, and a universal calling plan which allows you to make calls anywhere in the world for no extra charge. One of the best things about having this network available to you is that it allows you to use your phone to make calls to people who have a cell phone and even those who use VoIP or Internet telephony.
While the big advantages of having a Global Card are obvious, it is important to understand the differences between each one that is available. A few of the most popular cards are the Virgin mobile card, the Telecom Xpress Moxibustion pro card, and the Ovigna cellular card.