I have no idea, unfortunately. Tinkering with phones and ways to exploit messaging is something I haven’t done in a number of years.
My first guess would be yes? If you ever get a blank email with only the subject line of “Hi”, “Hello” or similar, it is simply a test to see if your email address is valid. It’s not a stretch to assume there are also simple ways to verify valid numbers that can also recieve text messages.
I have no idea, unfortunately. Tinkering with phones and ways to exploit messaging is something I haven’t done in a number of years.
My first guess would be yes? If you ever get a blank email with only the subject line of “Hi”, “Hello” or similar, it is simply a test to see if your email address is valid. It’s not a stretch to assume there are also simple ways to verify valid numbers that can also recieve text messages.