I like pre-paid cellphone plans which give me a small number of text messages, a small amount of airtime. Using these I can communicate with people when I am not near a WiFi AP. I do not want to pay for data and would prefer to use my and my friends' access points and the free wifi in the small number of commercial locations that I visit.
In Canada all of the major carriers disable WiFi Calling² on pre-paid plans. They essentially only enable it as crutch to leach off public infrastructure to take up the slack on their insufficient private infrastructure.
So I infrequently (but enough to be annoyed) find myself in the situation that I am not near a WiFi access point and wish to communicate with someone else. Currently Signal will only allow me to do this via insecure SMS messages.
I read their original explanation in 2015 for disabling this functionality. Namely SMS leaks too much metadata¹ and we are only catering to needs of real-activists in real-dictatorships, and anyway SMS is too expensive there so this is a 1st World Problem.
As an explanation it leaves me wondering why I would bother with Signal: if I bite the bullet and sign up for a circa CA$50/month plan with data I may as well just use Element Matrix over WiFi. Signal brings nothing to the table except the possibility of accidentally sending an insecure SMS message and incurring a 30c charge for it.
1. https://signal.org/blog/goodbye-encrypted-sms/ 2. https://support.signal.org/hc/en-us/articles/360007321171-Ca...