Why does my iphone say no sim when there's a brand new one in there?

I bought this iphone 4 on ebay second hand and the advert said it was locked to orange, I bought a new orange sim, I'm unable to activate the phone because it is still in factory settings and won't let me go any further without a sim

The phone is most probably locked to a network, because it was on a contract before that network has made it so that you can only use that network on that phone. It is possible to unlock this, i had this problem and couldn't fix it. Try looking on youtube for some solutions.

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