I have Iphone 4 v4.3 with BB 04.10.01 and it should be factory unlocked

have Iphone 4 v4.3 with BB 04.10.01 and it should be factory unlocked as the purchaser said and it supposed to work globally , i used my local sim at Egypt and said sim is not supported? , i did register my I4 first at itune and didnt update SW.
am I missed some code or step to start using my Iphone ?

There are a lot of posts (hundreds, probably) saying the iPhone is unlocked because the seller said it was...
If the iPhone was locked, and has been hacked to unlock it, then the first time one updates the OS it re-locks to the original carrier, (usually AT&T in the US, who will never unlock an iPhone for any reason).
Sorry. I could be wrong. But I would never consider buying an iPhone from anywhere but Apple or a fully authorised retailer, for this very reason.

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