How to tell if a iPhone is unlocked?

Okay I bought a iPhone 4s from someone who said it was unlocked but how will I know? Do I just put my sim card in it from my virgin mobile blackberry and see if it works? Or do I need to like do something else?

Turn it on. If it's unlocked, there will be no contract attached in the setup, and you will not see a carrier on the top bar. Good luck, and if you need any more help, visit my website: http://www.appstorechronicle.com/

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Restore it in iTunes. If iTunes says "This iPhone has been unlocked", it's unlocked. If it is originally an AT&T 3Gs, it iTunes won't say this. Yes, you can sell it to other AT&T users if that is an AT&T 3Gs.

Yes just put another sim card in it.

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