Potentially misleading smartphone features
1. Dual "stereo" speakers
First off, dual speakers don't automatically mean two channel sound, and that's an important consideration (not to mention, a requirement for stereo sound). But even when a smartphone does route audio through two channels, it's important to keep in mind that for a true stereo effect, the positioning of said speakers is also crucial. In other words, if both speakers are located on the bottom side of the phone, you'll experience no stereophonic sound.
2. Camera megapixels
In other words, don't just assume that because the Xperia Z3 has 20.7-megapixels, it's necessarily better than the Samsung Galaxy Note 4 (which has 16 megapixels). In fact, the Note 4 is actually the better shooter overall.
3. Look! A 256-core processor!
4. Dual SIMs
In short, the first thing you need to know with dual SIM, dual standby configurations is that when data or the call network is being utilized by one card, the other will be sitting in standby, meaning it'll be unreachable. What's more, the secondary SIM slot usually can only work with a 2G GSM network at most, so no blazing-fast internet speeds. Generally, if you expect calls to come through from both cards and are an active user, you may want to look into dual SIM, dual active devices (very few of those, unfortunately).
5. Very limited internal storage, but microSD slot
Not really. There are a number of drawbacks with microSD cards. For example, in Android 4.4 KitKat and higher, Google removed the ability to store apps externally on the card, citing security concerns. This means that unless your device has a specially-crafted workaround built-in by the manufacturer, or you are ready to root your device, you'll be unable to store anything more than media on that otherwise spacious 32 gig card. This can be quite a problem with apps' tendency to require more and more space, so keep that in mind when making purchasing decisions.
6. Incredible display nit brightness levels
Why? It's simple, really – because you'll never get as much brightness in a normal, non-lab scenario. Indeed, to actually reproduce Samsung's numbers, you'll need the screen to have 99.99% of its pixels shut down so that enough power can be routed to the few remaining ones in order to achieve such values. In other words, if you're looking at your Facebook feed, watching a video, shooting pictures, or doing anything else that can be considered normal, the screen will be significantly dimmer. That's why you should take such claims with a pinch of salt and wait for independent test results.
7. Dual LED flash
Not really. At least not necessarily. In our experience, a dual LED flash configuration on one phone can actually provide less illumination than the single LED flash config of another. So don't assume that an extra lamp will help you snap brighter photos in the dark – it could, but it's not a given.
8. Thinness has a price
Sleek-looking as they might be, however, such smartphones usually come with some kind of drawback that you should keep in mind. For example, the thinner the phone is, the less space there is for the battery (so lower endurance) and everything else. The camera, too, is often the victim of certain compromises. Lastly, a thinner device generally means less efficient heat dissipation, which, in turn, means throttling of the processor when using the phone for prolonged periods, and thus, worse performance.