No SIM Card installed on iPhone 3?

I have had my iPhone 3 for a little over a year, and it is hacked to be an AT&T GoPhone and it was in my pocket and I looked at it, and it said "No SIM Card Installed" and I reset the settings, turned it off, etc. I even took the SIM Card out. Nothing at all is working… How do I fix this problem, fast? Did I ruin my phone by taking the card out? Is there anything I can do without opening it up? (I'm willing to open it though) Please, I need a way to fix this!

Throw it against a solid wall & get a free Android phone from it ;-)

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