I got mine last week from the coop. They didn't need any ID at all (I might have shown my passport anyway, I can't remember) and for 5CHF you get a SIM card which has 15CHF credit on it.
I'm currently debating with myself just to buy new cards each time I run out of credit. Yes, my number keeps changing, but getting 10CHF free credit each time sounds cool
THey use the Orange network (and you can use the orang web page, which is in English, to check out various things).