[the_shivers]

Maybe the rescuers should try texting.

[dylan604]

because spam texts are not a thing?

[crystaln]

Spam texts wouldn’t say “This is search and rescue. We are attempting to contact you. Please call or respond.”

[volkl48]

I'm much more likely to glance into the spam folder on the phone to see what's going on when I repeatedly get messages I think are spam, than I am to pick up a repeated call from totally unknown number(s).

[pc86]

Yes, and that might even be reasonable, but add "also you're lost and disoriented on a mountain" and suddenly it becomes pretty ridiculous not to answer the phone.