How to unlock ipohone 4

hi.
I bought an iphone 4 from someone on Facebay and it was working but after one week I can't make or receive calls. I showed it to someone in the Town and he thinks it needs to be unlocked. can you help me to unlock my phone?

Did you perhaps do any updates to the operating system of the iPhone? If so, the iPhone was almost certainly been jailbroken to unlock it and the update or reinstalltion of iOS has relocked it. If the iPhone now tells you that the SIM is unsupported or a similar message, that would be strong confirmation of this being the case.
If the iPhone is locked to a carrier, only that carrier could unlock it. You'll have to go back to the seller, or call Apple technical support, and see if you can learn who the carrier is and then contact that carrier and ask if the iPhone can be unlocked.
Regards.

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