After connecting to itune to down load and update my 3gs iphone it is now telling me "no sim card" How can I get round this?, after connecting to itune to down load and update my 3gs iphone it is now telling me "no sim card" How can I get round this?

After connecting my 3gs phone to itune last night to download items and to get new updates my phone will not work, it says to add a sims card to phone but the sims is already in it.  How can I get my phone to work?

Sounds like your iPhone was previously hacked/modified/jailbroken
and the update has relocked it to the original wireless carrier. If that
is the case, only the wireless carrier to which the iPhone is now locked
can unlock it.
Does the app Cydia appear on your iPhone?
What does it say when you look at Settings=>General=>Carrier?
What wireless provider do you normally use?

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