There's at least one company (Mobal) that will give you a "real" (not VoIP prefix) phone number with a passport as a tourist, so that would work for DN too. The

There's at least one company (Mobal) that will give you a "real" (not VoIP prefix) phone number with a passport as a tourist, so that would work for DN too. The data part of their eSIM wasn't great but the voice part worked fine when I tried it. If you need health care it would definitely be a hassle at least if you don't have a lot of spare cash--you'd have to see if the mandatory travel insurance you purchased has some sort of direct payment arrangement with selected clinics. But it shouldn't be any issue to just receive the service and pay the full cash price, again same as a tourist. The real issue is going to be a bank account, which would primarily be needed if you tried to rent a "regular" apartment. The best workaround might be to see if the owner would take cash, up front if needed. You'd be within the "treated as nonresident" period at first anyway, so it would already be hard to get an account even with a residence card. If you don't need it for rent/utilities (ex. share house that takes online payments, hotel/airbnb, etc.) then you probably wouldn't want the hassle of opening and closing a local bank account anyway.