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The Iridium system is a satellite-based, wireless personal communications network providing a robust suite of voice and data features all over the globe. It is comprised of three principal components - the satellite network, the ground network and the Iridium subscriber products, including phones and data modems. The design of the Iridium network allows voice and data messages to be routed anywhere in the world. Voice and data calls are relayed from one satellite to another until they reach the satellite above the Iridium handset or terminal and the signal is relayed back to Earth. When an Iridium customer places a call from a handset or terminal, it connects to whatever satellite happens to be overhead, and is relayed among satellites around the globe to whatever satellite is above the appropriate Earth gateway, which downlinks the call and transfers it to the global public voice network or Internet so that it reaches the recipient. The Iridium system requires an Iridium Sim Card activate prepared before any communication or operation. The iridium sim card normally is not delivered together with the handset itself and must be bought separately. Iridium have prepaid plans and recharges available from 25 minutes until 5000 minutes. Prepaid iridium sim card is the ideal solution for short or medium-term trip and seasonal user looking for great airtime rates during his trips, holidays or professional activities. Without any contract, no monthly invoice, the prepaid iridium sim card is the best choice for user who know how much time he need and want to keep the communication cost under control. If the customer expects to use the Iridium services extensively it exists a Iridium Sim Card named Global plan. The most popular choice actually is the Global 500 min plan with 1 year of validity. This Iridium "Global Plan" contains 5.000 minutes (300.000 units) worldwide airtime and is valid for 2 years from the date of activation. Remaining minutes roll forward when additional minutes are added before to expiry date. The Global voucher “5.000 minutes” (300.000 units) airtime refills your existing Iridium Global plan with 5.000 minutes of worldwide. For more information regarding Iridium Sim Card please visit www.prepaidsatphone.com
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