I was disappointed to find out that my girlfriend's iphone (albeit a few years old) is not able to charge my wireless earbuds. A feature I've enjoyed on my Samsung phones for as long as I can remember.

Reverse charging is still not a feature on iPhone

"You can use your iPhone 15 and later to charge your AirPods, Apple Watch or another small device that supports USB Power Delivery at up to 4.5 watts." from https://support.apple.com/en-gb/105099

This works with my Beats headphones and is very useful.