IMPORTANT: Now Choose Your Second 'Backup' SIM
Enter your email to be the first to hear when new 'free SIM' offers are available:
What Is a SIM Card?
A Subscriber Identity Module (SIM) on a removable SIM Card securely stores the service-subscriber key (IMSI) used to identify a subscriber on mobile telephony devices (such as computers and mobile phones). The SIM card allows users to change phones by simply removing the SIM card from one mobile phone and inserting it into another mobile phone or broadband telephony device.
Tmobile
T-Mobile is a mobile network operator headquartered in Bonn, Germany. It is a subsidiary of Deutsche Telekom and belongs to the FreeMove Business alliance. T-Mobile is a group of mobile phone corporate subsidiaries (all under the ownership of Deutsche Telekom) that operate GSM and UMTS networks in Europe and the United States. The "T" stands for "Telekom." T-Mobile also has financial stakes in mobile operators.
Vodafone
Vodafone is a mobile network operator with its headquarters in Newbury, Berkshire, England, UK. It is the largest mobile telecommunications network company in the world by turnover and has a market value of about 75 billion GBP (August 2008). Vodafone currently has operations in 25 countries and partner networks in a further 42 countries
Three
3 is a brand name under which several UMTS based mobile phone networks are operated in Australia, Austria, Denmark, Hong Kong and Macau, Indonesia, Ireland, Italy, Sweden, and the United Kingdom. Hutchison Whampoa owns direct majority interests in the companies that operate the networks that are branded 3, except 3 Hong Kong and 3 Indonesia.
