Kind of need battery life to power your phone to also communicate with other people. Most people don’t want to carry around a battery pack
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Also while the xr screen isn’t as high res as the X that doesn’t mean it’s low res or completely garbage.
There are also battery chargers for the car, battery cases, but some of the battery pack solutions are very easy to use and slim as well. I'm not trashing the XR specifically, many are happy with it, but switching off a 1 year old iPhone for some may not be the best solution.