Ever wondered why iPhone from the US needs to be unlocked? In the US all iPhones are locked to a carrier,AT&T or Verizon. AT&T allows you to unlock your phone after two years when the contract gets over or if you pay an early termination fee. Otherwise if you want to switch carriers you have to hack into your phone to unlock it. Even this is not simple because on the US,AT&T & T-Mobile use GSM and Verizon uses CDMA. So if your iPhone is only equipped to work on one you cant take it to the other.
The iPhones that are released in India are factory unlocked so users can switch wireless carriers at will without hacking or worrying that future Apple software updates will reduce their iPhones to a brick.
The iPhones that are released in India are factory unlocked so users can switch wireless carriers at will without hacking or worrying that future Apple software updates will reduce their iPhones to a brick.