LG G5

Design: This is not your modular fantasy

When LG first showed off the G5, it made a big deal of it being the first phone with modular capabilities. This ability to swap out and customize certain hardware parts has been a longtime fantasy for mobile users. Like building a personal computer, you can upgrade certain components that are important to you or fit a certain need. If you're going somewhere where you're going to take a variety of photos, for example, you might want to swap out your handset's stock lens for a fisheye or macro lens.
To use the feature, you'll need to push the small button on the device's left edge. The bottom of the G5 will pop out, allowing you to yank the attachment off the battery, clip the battery into the new module and push it all back together. Because the battery is attached to the bezel, the handset powers down every time you swap something out. This isn't a huge deal, but it takes time to fire up the phone after a switch, and if you swap parts often throughout the day it can be a power drain.

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The G5's bottom bezel can be removed and swapped out for another accessory. James Martin/CNET

Google attempted to make a modular handset with its Project Ara, but development on that stalled. The fact that LG got this off the ground is a win, but the feature is limited for now because there are only two accessories (so far) that take advantage of it.
One is called the Cam Plus. It's a camera grip that has a physical shutter button to record and capture video, and a zooming wheel. It also has a built-in battery, which you can use on top of the phone's battery for extra juice. The other accessory is the Hi-Fi Plus, a portable digital-to-analog converter (DAC) that boosts audio playback for high-definition sound files. Because the Hi-Fi Plus includes an audio grill, a USB Type-C port and a 3.5mm headphone jack, you can leave it attached to your G5 and use it all the time.

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The LG Cam Plus camera grip, which can attach to the handset.