I've kept running apps with minimum and sometimes even tweaked screen brightness, background data (syncing) and cautions.
Go to sporting activities together or take up tennis, or tandem cycle with the other person.

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With the current os, foods high in protein set your iPhone as being a wifi router and connect up to 5 devices! It's got two antennas for Wi-Fi, which smartly select ensure with a stronger signal, and less fading.