Best answer: A foldable phone is exactly what you think it is: a phone that can fold in half. Some fold vertically, others horizontally, but all of them have one thing in common — they turn a small device into a bigger one.
Most of the people buying smartphones are looking for something with a sizable screen. Phones have come a long way in regard to making the screeen as big as can be without making the phone body any larger. However, once you've stretched out the aspect ratio far enough and there are no bezels left to remove, there was only one thing left to try: fold things into a smaller package.
The foldable craze actually dates back to 2013 with the Kyocera Echo. Much like other foldables from LG and ZTE, it used two separate displays and a clamshell hinge. The original folding phone didn't do a lot of things very well, but there was one exception: it could flip open into an almost tablet-like experience but still fit into your pocket when it was closed.
The first "true" foldable(s) — the Samsung Galaxy Fold and the China-only original Huawei Mate X — took things to the extreme. When folded you had a usable large phone that worked the same way other large phones did. The only real difference was a bit of girth and the unsightly center bezel when the display folds.
The second wave of foldables — the Samsung Galaxy Z Flip and Motorola RAZR — are different. They're focused on giving a traditional large-phone experience but can convert into something super easy to carry. They do it by flipping open vertically.
The Z Flip does this exceptionally well. When closed it resembles a compact mirror or eyeshadow plate but flips open to reveal a 6.7-inch bright Super AMOLED display. This gives you the usability an extra-large display has to offer when it's open, plus the pocketability of the smallest phone when it's closed.
There are drawbacks to foldable phones, of course. The biggest is glass, which is usually very rigid and fragile. That means foldables all have a plastic display — though the Z Flip does have glass sandwiched in the screen layers — and plastic isn't a great experience when it comes to multi-touch smartphones.
There were a few bumps in the road, as should be expected from any new category of tech, but by and large the people who are buying foldables seem to love them. The folding action means a single phone can come in two sizes, and if you want a big phone that converts into a small tablet or a small phone that opens into a bigger one, the category already has you covered.
We expect the category to grow. If interest and demand stays high — the Galaxy Z Flip sells out as fast as Samsung can offer them — we should see more and more companies bring folding phones to market in the coming years and the high prices to come down a little.
The most user-friendly with the fewest compromises
The best part of the Galaxy Z Flip is its ability to feel like a normal phone when it's open, and then quickly fold in half to a compact size.
A Big Screen
A tablet that folds down into a phone, sort of.
Samsung's first foldable comes with more compromises, but a perhaps more intriguing form factor.
The Motorola RAZR makes an enticing first impression with its old-school design, but once you look closely at the phone, you quickly realize there's not much to sink your teeth into.
We may earn a commission for purchases using our links. Learn more.
Grab a case that comes from the same place as your Note 20
Now that the Galaxy Note 20 and Note 20 Ultra have arrived, the first thing you'll want to do is pick up a proper case. But instead of waiting around for third-party retailers to make their cases available, why not grab one from Samsung alongside your Note 20, giving you the whole package right at your doorstep?
Best Android phones with a 3.5 mm headphone jack
When you have to have a headphone jack, your options are more limited today than they were a couple years ago. But there are still several amazing choices.
Ditch the cable and go wireless with these charging pads and stands
Charging with a cable is faster, but a wireless charger is much more convenient. These are the best you can buy, whether you want a pad, a stand, or a multi-device charger.