we had a nice one, after setting up the shoot, getting hair, MUA, fashion person hired she started not replying and eventually - 10 min after she was supposed to show up - she sent a message "sorry I did not reply, my cellphone got stolen".
Uh, well, that's too bad honey, but don't you have a computer? Friends? Internet cafe, ANY way to get online and get in touch? What, you live alone on some island?
Luckily we were able to get an other model to show up quickly and had a great session, but she won't be called back in....
You have something set up, you FIND a way to get in touch if you can't make it, simple as that. Unless you're dead or in a coma. Or on some remote island - I guess.