Area code 212 numbers are hard to come by. You will probably just have to settle for a number in the overlay code 646, which also serves Manhattan.
You cannot find totally free codes for the iPhone 4.
By pin
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You can gift codes on MMX racing for iPhone on itunes.apple.com/gb/app/mmx-racing/id835969177?mt=8
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The Unlock codes for iPhone 4 to unlock the service network is usually provided by Vodafone who usually verify the information with Apple.
You get codes by buying cards at stores, an iphone app called wizardblox and doing minigames at kifreegames.com
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Either get cards with codes on and dont tell anyone or get books
9CTKKR gives you unlimited fuel