Even with the seeming ubiquity of cellphones, there are still plenty of opportunities for missed connections, not to mention the fact that not everyone has a cellphone. Yet. When Mr Lush and I were in Japan, for example, our cellphones didn’t work at all since they aren’t 3G, and we never managed to find any wifi signals either. Totally incommunicado for 10 days, except for the very occasional (and expensive) Internet café visit.
Personally, I’m more impressed by authors (and film makers) who incorporate new technologies rather than look for clever ways to circumvent them.