IPhone 4 on iOS 6.1 not reading SIM card?

Basically my iphone 4 won't recognize/read SIM cards. I've tried multiple activated sim cards and keep getting an error message such as "No SIM card installed, Insert a valid SIM with no PIN lock to activate iPhone" and "and activation request could not be completed. If the problem persists contact customer care." the iphone was jailbroken before i updated it to iOS 6.1. Its also locked to at&t

Added (1). Have tried using the original SIM card. The phone doesn't even recognize that the SIM is inserted its just says "NO SIM" at the top

You need the original sim card that came with that iphone.

Since its locked, make sure you're using an AT&T microsim and that it sits in the card holder properly, you should hear an audible click when the holder is inserted correctly. The micro sim itself does not have to be active but does need to be free of scratches as iPhones can be activated and registered via a Wi-Fi connection.

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