Nano-SIM standard decided by European standards institute

The European Telecommunications Standards Institute (ETSI) has announced that they have decided on the next generation of Subscriber Identity Module (SIM) cards. The original iPhone (and many other phones) used mini-SIM cards. The iPad and iPhone 4 were among the first devices to use the much smaller micro-SIM standard. This new nano-SIM design will be 40% smaller than current iPhone micro-SIM cards, measuring 12.3 mm wide, 8.8 mm high, and 0.67 mm thick. 

Source: http://feedproxy.google.com/~r/TheIphoneBlog/~3/BU7-uH4z0NM/story01.htm

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