The link below is evidence that the text is king (or queen)! After a disaster do not tie the phone lines up, but use short texts to your family members to ask "R U OKAY?", "Meet @ Jason's".
By learning to text and making sure everyone knows how, you will decrease everyone's stress point in the aftermath of a disaster by being able to communicate quickly and efficiently.
Last point for those of us over 50, honestly if you have never text-ed on your phone ask your kid; allow them to become involved in the family preparedness and be the teacher for once. In this instance they probably are smarter than you.