dawt so it's definitely detectable
I'm not saying it's not. That's why I wrote "Jmp warns about this".
dawt but don't expect to be able to create new accounts with that number.
Agreed, and I'm eagerly waiting to find a service where it won't work, but in practice, to this day it works every time.
Jmp is good for a use case where your mantra is to avoid having a phone number. You just have to have it for things like doctors and government services, because there's not much choice as you want to be contacted and they just don't have any other means or process for that. In any other situation I just literally say "I don't use a phone number" while holding my pixel in my hand. If they have questions after that I say "I just use WhatsApp with data only sim". Funny enough one guy said "you need a phone number to use WhatsApp" and I just replied "I don't have that sim card for years". This strategy worked for me for years even before I got jmp. Never had an issue.