Hi i update my iphone 3g but i couldnt activate the phone, could u help me pls

hi
i update my ihone 3gs 16 gb phone, after i update the phone i coudnt activate the phone. it says there is no sim card even sim card is inside there. and i take out the sim n put another sim and still its says same thing.

Sounds like your iPhone was previously hacked/modified/jailbroken
and the update has relocked it to the original carrier. You will have
to contact that carrier to see if they offer unlocking and if you qualify.
Only the wireless carrier to which the iPhone is locked can unlock it.
Does the app Cydia appear on your iPhone?
What does it say when you look at Settings=>General=>Carrier?
Where did you acquire this iPhone? What wireless carrier do you use?

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