@Peterleinchen: Thanks, no luck.


@Pichlo:
It's hard for me because when supermarkets are open, I'm at work. And when I'm done, supermarkets are closed.

Not your average phones. But this second hand N900 lacked one of these little screws, so one internal component was not firmly placed. And this component seemed to hold the SIM card. Worked fine for one or two years, but some day it started to "dance". The result was about ten connections/disconnections per minute when I was handling the phone, even more while walking. That killed all those SIMs.

Phone SIM contacts seem to be OK. Let's bet (and pray) on the card. I'm gonna get the answer next Saturday.