I’ve been using the same phone — an iPhone 5S — for nearly two years now, and it works fine. The battery life could be better, and I’m sure a newer model would be a bit faster. But I haven’t been able to justify an upgrade, because it still works.

Eventually, though, I’ll have to make the jump. Maybe the next version of iOS will slow it to a crawl, or perhaps the screen will crack, and I’ll use that as an excuse to upgrade. Or maybe I’ll get addicted to some new, battery-sucking game, like Pokémon Go, that demands a bigger screen or longer battery life. Everything breaks or becomes outdated at some point, and there will come a time when my tolerance starts to wane; I just don’t know when that will be, and I’m not sure how to anticipate it.