Factory unlocked iphone 4 asking for sim?

I've received a factory unlocked iphone 4.It is factory unlocked, I even checked the IMEI on iphoneoperatorcheck.com and it say UNLOCKED. When I inserted the microSIM, it said "SIM not valid; Only Compatible SIM Cards from a supported carrier may be used to activate iPhone. Please insert the SIM card that came with your iPhone or visit a supported carrier's store to receieve a replacement SIM card"

Why do you think that is?

Its might just be carrier unlocked, meaning it will only work with that carrier.
if it is factory unlocked, try a diff sim card.

You need to unlock it

Hactivate it with redsn0w.

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