To be more specific, I live in Denmark. Last time I had to transfer my number, it was quite a hassle. I had to show up physically in a store, and they needed

To be more specific, I live in Denmark. Last time I had to transfer my number, it was quite a hassle. I had to show up physically in a store, and they needed to scan two ID cards of mine. In addition, because I have a legally hidden address, the guy in the store needed to contact someone inside to confirm me. Essentially, he was not able to do it on his own. In fairness, that was me moving from one carrier to another. I assume, if I were to get a new SIM with the same carrier, it would be a lot easier. I have been trying to figure out what it would require for me to change SIM within the carrier, but their help articles aren't clear on this, besides mentioning it is possible (my impression is that they will ship the SIM card by postal services).