You don't even need to move to Antarctica, just moving to a different country is enough to experience a lot of SMS pain. Many companies are hardcoded to only allow SMS to numbers in the same country code. Even if you work around this by bringing a SIM card along (meaning paying for a plan, keeping it topped up, etc), you can still run into issues if they're sending SMSes from an country-specific short code and you ever need to reply for any reason ("Is this transaction fraud? Reply Y/N in the next 10 minutes or we'll helpfully cancel your card!").
I've been lucky enough to have my phone number for the past decade and all of the services I use have already authenticated that number. When I moved to Europe earlier this year, I ported my number from BIG_NAME_CARRIER to Google Voice and so far everything has been fine.
That said, I'm still vigilant for alternative login options when I see them because I assume sooner than later, some company will audit all customer numbers on file and realize mine has changed from `mobile` to `voip` like mentioned in the article.
I think the only ones still tied to my number are a credit card and a neobank, but I could theoretically live without those.
I've been travelling for the last two years. With Wifi-calling, I can send/receive calls and text messages just fine. The only caveat is when I am outside of wifi I have to turn a hotspot from the other phone.
gave my number to bank to send me TOTPs, and then moved away literally dozens of thousand km away to find out that roaming is not enabled by default (had to buy a new sim card from new carrier), you have to visit office in-person, and on top of that, bank wouldn't send SMS to foreign numbers, so my card is good to cash out basically, forget the online payments
