My SIM can't be recognized on iPhone3GS

When I updated my jailbroken iphone 3GS, It can't recognize my SIM card any more and won't activate

I tried jailbreaking it again but it did not work. Any solutions?

Added (1). Btw, i live in the philippines. I think our SIM system is different from other countries

Put it it in DFU(device firmware update) mode here is how:
1)Turn the phone off
2)Press and hold the home/wake and sleep/power on button for 10 seconds
3)After the ten seconds let go of the power button and continue holding home button for a further 10 seconds.
Now iTunes will inform you that it has discovered an iPhone in recovery mode, Go to the iphone tab and it should give an option to restore the iPhone press that, after that let it do its thing now if you require additional assistance for DFU mode go to this link: http://limitededitioniphone.com/how-to-put-the-iphone-into-dfu-mode/#comments

It might be locked. For example: space say your AT&T mobile and you have a Sim card it's Verizon

Just to cover for information sake, are you sure it was hardware unlocked and not software unlocked? I know it's rejecting your AT&T sim which means over seas bought but I could still have been a software unlock which would make it not work when new iOS installed.

If it is hardware unlocked for sure then go into settings and reset is in there somewhere. Can try to do a full reset and let it try to activate connected to iTunes.

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