How to know that iphone 4 is locked??, How to know that iphone 4 is locked??

How to know that iphone is locked or unlocked ?
In my case when I put the sim card of SK telecom the iphone display the carrier of SK telecom and when I replace the sim card with KT then it displays the carrier with KT telecom in the settings.
Does that mean my iphone is unlocked and it is  carrier free?
In my case these both sim are expired so they dont show any networks.
They just display "Searching " and then "No service" but in the carrier section (settings) it displays the corresponding telecoms and the phone numbers.
So is it unlocked phone.
If it is unlocked phone then I was thinking o use a mini sim card(SK telecom) in it which is not expired by cutting it into micro sim card .Will it work ?
Help me !!!

dipencha wrote:
How to know that iphone is locked or unlocked ?
The ONLY way to know for sure whether your phone is officially unlocked or not is to have purchased your phone from an official source that sells officially unlocked iPhones. If you did so, you have nothing to worry about. If you did not purchase from an official source, well...you take your chances and hope for the best. Many phones, from non-official sources, advertised as "factory unlocked", are in fact hacked to unlock them.

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