To enable this on most Android phones, go to Settings > System > Gestures > One-handed Mode and turn on the switch for Use one-handed mode. If you can't find the setting this way, go to Settings and search for that term.
Can you use iPhone 14 with one hand?
I've been using the regular iPhone 14 as my primary device for the last few weeks. I can't quite wrap my hand completely around it, but close enough. More important is the fact that it's easy to use with one hand.