Ok guys, i too have broken 1 pin from the sim tray, and i got some tin foil and placed it where the missing pin was and slid my sim card in and it worked. If it works for you please reply. if you need a picture please reply.
I'm in the same boat but I didn't leave the Nexus S in my drawer like some of the folks here. Here's what I did...I used a small thin-film conductor (like a wire or or metallic point of contact) and slid it with tweezers at the point of the break (I had the middle pin broken) and then slid the sim card over it.
The SIM card will try to push this film out. That's where the tweezers help. Gently lift the SIM card and lodge it in again. This basically creates a short circuit between the joint where the pin would have been and the place on the SIM card where it needs to connect.
Super simple solution without soldering. But, you still have to re-do when you swap a sim card.
The SIM card is a tight fit and hence the film will stay.
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