You can get replacement SIMs with the same number (source: I'm in Germany and on my third SIM with my current number after first not having a micro-SIM and then a nano-SIM) – I did get notofied of this by SMS, though, and no idea what other anti abuse measures may be in place. I can order one for 10 Euro via the website anytime and I suppose I could do it via phone as well.

There was actually a scandal about that in Denmark recently. Some journalists managed to get new SIM cards for other people without proper authentication. Repeatedly and from different providers.