I'm that guy without a cell phone and I mange to do just fine. Email usually works or a land line (I'm either at home, at work, or on a gig).
And no, I'm not "technologically challenged". I'm an electronics design engineer and I work with leading-edge tech all day long. I just don't care to have a cell phone. I manage to get plenty of work - 2 VERY different gigs this week, 2 next, 2 rehearsal this week, Church this Sunday, recording sessions coming up in December... All scheduled in the past few days, last minute.
I'd tell any band the same thing I tell my employer: if I must have a phone for your convenience, then you pay for it.