Dropping your iPhone may crack it, but the most likely way to ruin the screen is to scratch it. You might drop your iPhone into your bag and let it rattle around with your keys. You may absent-mindedly slip some change into your dedicated iPhone pants pocket. Or your significant other might pick up your week-old iPhone and a nail file in the same hand, gouging the screen so badly that the scratches are all you’ll ever see from then on.

To prevent this, you should get an iPhone screen protector. Here are the best you can buy.

The iPhone comes in such a simple form that you could think of it as the core brain of a larger system. If you need to go underwater, you can get a case for that. If you want to turn it into a satnav for your bike or stroller, you can do that, too (see below).

The iPhone accessory market is huge, and there is a gadget or gizmo for almost anything. Here are some of our favorite iPhone accessories, for the new iPhone X as well as for older iPhones.