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>Somewhat related, but I have hard time watching older shows/movies where the plot only works because people do not a have cell phones.

One of the funniest moments in the Buffy spin-off Angel was when the title character was trapped somewhere, and after managing to escape he's asked by his friends why he just didn't use his cellphone to call for help - at which point he's at a genuine loss for words, because he did have one with him at the time.