What is a lock iphone 4 and an unlock iphone 4?

An iphone 4 lock and an iphone 4 unlock, what lock and unlock means? Which should I buy?

I hope help you

http://www.huffingtonpost.com/2011/06/14/unlocked-iphone-4-vs-locked-_n_876759.html

The unlocked iPhone 4 can be used on any company with an unlocked sim card. An iPhone 4 that is locked is only able to be used on the company that it is made to be used on originally.

Example (iPhone 4 locked): the iPhone 4 is made to be used on AT&T. You put an unlocked Straight Talk sim card in the iPhone 4. The iPhone 4 will not be compatible with the Straight Talk sim card.

Example (iPhone 4 unlocked): The iPhone 4 is made to be used on AT&T. You put an unlocked Straight Talk sim card in the iPhone 4. The iPhone 4 will now use the Straight Talk service.

A locked iPhone 4 means network restricted handset. It may be accessed with only one particular network to which it is locked.
An unlocked iPhone 4 means a network free handset. It can be accessed with any international GSM SIM card.
iuggest you to buy a locked iPhone 4 and unlock it yourself for your use. Becaus locked iPhone is less in cost. You can also unlock it safer and easier using remote unlocking service. You can get the remote unlocking service for an iPhone 4 from http://www.simpleunlocking.com/apple-iphone-4/rs16wp9/ at low cost. You can also visit http://www.mobileunlockguide.com/apple-iphone-4 to get free unlocking instruction. This could help you understand unlocking process better.

Unlock means you can use it with other carriers.

You Should buy an Unlock iPhone 4, Locked means you can only use it with Specified carrier provider. Unlocked means you can use it with any network provider service. If you buy locked phone you need to unlock it to use with your network service. I unlocked mine iPhone 4 UK Vodafone using third party service on the web.

You are suggested to buy the unlocked iPhone 4

locked iPhone 4 means you can only use the particular mobile phone carrier SIM card;

locked iPhone 4 means you can use several mobile phone carrier SIM cards;

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