This phone despite being a phone with a removable back has managed to pull a modern smartphone look. The black has a great soft feeling plastic which feels great in the hand. The front facing fingerprint reader is also a wonderful touch for a phone that is barely over $100. The water-resistant design is a nice touch, but don't go dunking it into water anytime soon.
Overall, the display is excellent. The screen is very colorful and bright. The screen can also get decently dark as well. The screen is only 1280 x 720, but it is hardly noticeable when watching videos. Speakers are decent. Sound is faithful except for the highest volume settings where the audio can become slightly distorted. They sound pretty good for a phone in this price range.
It is great to have a phone out of the box with Nougat (Android version 7). Moto's phones have always had a great OS because they are near stock android. The near vanilla android experience in itself worth it.
The camera is possibly one of the greater aspects of the phone. The phone in general gets the proper exposure in light situations. The phones are rarely grainy and focuses on objects quickly. As with every camera, the camera weakens slightly in the low light department. HOWEVER, the camera does outperform many smartphones even some mid ranges in this department. The phone also has great controls for manual mode if you want to get the best picture. The front facing camera is also great and performs as expected.
For the most part, the battery life of the Moto E4 is just average but solid. In the age of larger battery capacities and quick-charge/fast charging, the Moto E4 is basically adequate. The phone can easily get you through a full day, most likely due to the fact due to good battery management, lower screen resolution, brightness controls, etc. The batteries are also swappable, so that might be a bonus for some.
The base storage is a bit lacking at 16GB. However, it is really good to know that the storage is expandable up to 128GB which is more than enough. The nice thing about expansion is that you can use the external storage as internal memory. I think the ram is decent enough considering the price of the product.
Perhaps the biggest weakness of the Moto E4 is the processor. However, I have seen worse processors being used around this price-point so that is something to consider as well. Now if you do light gaming, emails, basic web browsing searches, this phone performs excellently. Things like basic streaming such as videos and Netflix performed well. However, with heavier duty games, the games will show noticeable signs of stuttering and/or frame-rate issues.
Other (Calls, Compatibility, Accessories, Firmware/Updates):
Call quality was great. No issues or distortions. The wonderful thing about this phone is that it is UNLOCKED and works with GSM and CDMA so basically all the carriers.
At the time of this review, there is only a decent amount of support for accessories. BE CAREFUL, the international version of this phone is different from the US version. Please lookout for this when choosing which accessories to buy. If you need some suggestions: I recommend for cases: Dretal or Otterbox and for screen protector: amFilm, Mr.Shield, or Supershield. The phone uses a standard micro-USB, so replacements are easy to find.
Moto has been generally fast and reliable about updating their phones. The phone should get at least 2 years of android updates.
This phone is not the greatest in the world. HOWEVER, it may be the greatest phone for what it does at this price-point. The phone is cheap without being cheap. In a way, this phone is truly king in the under $150 category. My suggestion is to choose based on your needs and willingness to pay. It is great to see a phone with great value at this price-point. And hey, at least it has a headphone jack.