iPhone 3GS No Service Problem

Hey everyone,

So last night I was replacing my dock connector, and after I placed everything back together, I realized that the phone was no longer reading my SIM card properly. I've tried resetting the phone, on/off, taking the card out and putting it back in; nothing seems to work. No other cards work in my phone. Did I break something/ knock something loose when I was repairing it?

*EDIT
Also, last night it got service for like 10 seconds, with only 1 bar, and then it went back to 'searching.'

The phone is unlocked, and I am using T-Mobile. I am not getting any messages saying that the phone can't read the SIM card, it just keeps searching..