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Why Apple Switched to MicroSIMs

4phun

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MicroSIMs come with a couple extra features:
  • allow for multiple simultaneous applications accessing the card through logical channels;
  • introduce mutual authentication as a way to eliminate carrier spoofing by allowing the SIM card to authenticate the cell tower to which it is connecting;
  • add a new PIN protection with hierarchical PIN management with a universal PIN, an application PIN and a local PIN;
  • expand the phonebook storage of the SIM card with entries for email, second name, and groups.
 

gentlefury

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forgot, hardware locking the device to AT&T while saying it is an unlocked device.
 

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