How often do you run into a situation where you're forced to enter a phone number? Do you enter a non-existent one or do you use your POTS number? Do you run into situations/signups where you need to verify a number, and if so what do you do for that?
The idea is very attractive, but it seems like the rest of the world is stuck with the mindset that you have to have a phone number, email address, and even a physical address.
T-Mobile uses the same name ("Simple plan") for their different offerings, one of which is international roaming with a credit check. I tried to get this plan, and T-Mobile wasted hours of my time and money on satellite phone calls to them and royally pissed me off with their extremely incompetent support. Apparently I was given the wrong plan when I signed up initially in the US, and then they tried changing my plan to the correct one, but it never worked. I wouldn't touch T-Mobile with a 10 foot pole.
The idea is very attractive, but it seems like the rest of the world is stuck with the mindset that you have to have a phone number, email address, and even a physical address.