yeah, exactly, if they’re going to be driving or be away from home then it makes sense to have a means of communication.. and yes, by the time university starts up if they’re not mature enough then not much you can do, Allah hi hafiz hay phir. 
but that’s why its important to grind in those good values and morals at a younger age; I get the feeling that some parents just let their kids drift in the misguided hope that they will miraculously be correctly molded by society..
as for the jitterbug, it’s probably the simplest phone out there, designed for old people who are completely alien to technology.
check it out, the second model on the right doesnt even let you dial a number; you just call the operator and tell them the name of the person you want to call and they connect it for you 
i guess you have to give them a list of people beforehand when you start your service.
http://www.cameraphonefocus.co.uk/images-articles/jitterbug%20onetouch_01.jpg