Sim failure help! Iphone 3gs?

I bought a iphone 3gs off ebay and put my sim in it but it keeps coming up with sim failure what do i do?
it was jailbroken when i bought it but it was an orange phone and i'm with orange now the software is all updated but nothing is working apart from my Wi-Fi please help

Added (1). Cydia is not working i can't open it now nothing is working

Install cydia again but when the phone is not over heated it will show the the signal of your router but no signal of your gsm carrier still waiting to find a faw to get teh signal, but you could work the phone as a computer network

iPhone 4 no sim card installed problem Video 2

1- get the ios 5.1.1 http://www.redmondpie.com/download-5.1.1-ios-for-iphone-4s-4-3gs-ipad-ipod-touch-direct-official-links/

2- click red snow 9.11 b4 http://blog.iphone-dev.org/post/18906290309/march-mayhem

3- select manual ipsw 4- select the iPhone2, 1_5.1.1_9B206_Restore 5- go back 6- select base band 7 click next cydia will be installed 8- go back again and select reboot you must be in the dfu mode the iphone will finish then reboot

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