[samuellb]

Yes, security of number porting is too lax. My number was once ported by a telco (accidentally in this case). They did call me and I had to confirm that I would get a new SIM card and which size I needed, but since I was expecting a new SIM card from the very same telco I didn't understand that they were in fact porting my number. They forgot to say that.

Luckily I was able to get my number back, after many calls to customer support (they managed to undo the porting when I wanted to check how it was going) and a couple of weeks of waiting.