The HTC Bolt is a Sprint-exclusive phone released in November 2016. At a quick glance it's clear to see the Bolt builds on the HTC 10's design, but there are a handful of subtle external and internal changes.
The Bolt offers the same great solid aluminum design with big chamfered edges as the HTC 10, but with a larger overall body to fit a 5.5-inch Super LCD 3 display. The back is also perfectly flat, which deviates from the curved back on the HTC 10. Internally, things are actually generally a step back from the HTC 10 — there's a last-gen Snapdragon 810 processor and 3GB of RAM powering it. HTC isn't using the UltraPixel branding or extra processing for the camera, though the 16MP sensor with f/2.0 lens is capable.
One other critical missing feature is the headphone jack, which HTC has dropped in favor of handling all audio over the USB-C port. There's a pair of USB-C headphones in the box, and HTC does some neat things with them such as automatically adapting to your hearing profile for clearer sound, and also adapting to ambient noise for better clarity.
This is HTC's first phone shipping with Android 7.0 Nougat, which is definitely a selling point. The Bolt still looks familiar, though, as HTC's simplified Sense interface still changes the icons, launcher, lock screen and keyboard while offering full device theming and a few additional apps and features you don't find on Nougat by default.
Since this is a Sprint-exclusive device, HTC built the phone to specifically tailor to Sprint's latest 3x CA (carrier aggregation) LTE network, which at the time of launch makes it the absolute fastest phone on the network. By combining three different frequencies, the Bolt can offer LTE speeds higher than other phones — theoretically, of course.