How else can you charge a smartphone besides using a cable?

Solar chargers - that's what really saves you in extreme situations. They're portable panels with a built-in battery that run on solar power. They work slower than regular charging, but if you're stuck without an outlet, they're a lifesaver. The main thing is to pick a model with enough capacity and make sure it's compatible with your phone.

There's also a more creative option - mechanical chargers based on kinetic energy. Some of them charge from shaking or spinning, though they don't usually produce much power. But if things get really tight - better than nothing.

As for power banks, which have already been mentioned, I'll add: if you want to always have a backup, get one with high capacity and multiple ports - you'll be able to charge not just your phone, but your tablet and headphones at the same time. And yeah, wireless charging is convenient at home, but it only works at home or at the office, so it's not practical for when you're on the go.

Magnetic cables - that's actually a convenient thing people often overlook. You insert the magnetic connector into your phone once, then you just stick the cable to the magnet - faster than hunting for the right port in the dark or when your hands are wet after fishing. The cable doesn't wear out as quickly because you're not jamming it in with force every time.