I bought this phone in December 2017, having moved up from the Posh Micro X. I had planned to write a review comparing the two phones (e.g., size, weight, features, battery life, and so on). Since the Posh Micro does not appear to be available any more, there's no use in writing that review. In summary, though, the Unihertz Jelly is the superior phone - although I did like the slightly smaller size of the Posh Micro - but it failed in one feature: the GPS. Other reviewers have noted the erratic nature of the GPS and for me it was virtually useless. When I used it to navigate, it suddenly had me off the interstate and driving through neighborhoods several blocks away. This phone would be a great tool to use when running, especially when wearing it with the optional armband, but without a functioning GPS, I couldn't reliably track my run. A five mile loop around Stone Mountain turned into 6.95 mile straight line, though the GPS did generously shave a couple minutes off my pace!So, I contacted Unihertz support. They informed me that they had made improvements in the GPS and, since my phone was still under warranty, offered to exchange it if I would ship my phone to China. I was reluctant to do so since, first, I relied on my phone every day and, second, shipping to China by a trackable means isn't cheap. Still, I backed up my data, reset the phone to the factory setting, and shipped it.Meanwhile, I resurrected my old Posh Micro, which loosely fit in the Unihertz armband. It told me that a 3.1 mile (5 kilometer) run through the woods was 3.09 miles. Wow! Subsequent runs were similarly accurate. I kept my fingers crossed for the replacement Jelly.When it finally arrived, I eagerly took it for a run. It measured that same 3.1 mile course through the woods as 3.15 miles. The GPS told me the five miles around Stone Mountain is a loop of 5.15 miles. In addition, it reports changes in elevation, which the previous Jelly did not. It's still not 100% accurate, since a couple times it has dumped me off the interstate when I'm driving, and it straightened out a curvy stretch of trail when running. But, my daughter's expensive Garmin watch sometimes misreports her runs, so that might be the nature of GPS.So, Unihertz has indeed addressed the GPS issue. I'm happy with the phone, which I can comfortably store in my pocket. I can run with it, listening to podcasts and reasonably accurately tracking my route and pace. Since Georgia passed a hands free driving law, I can use Bluetooth earbuds or connect to my car stereo and use Android Auto to navigate in traffic, send and receive phone calls and texts, and listen to music and podcasts. But it has to stay plugged in because Android Auto will flatten the battery pretty quickly!UPDATES: A question was asked below about Android Auto. For unknown reasons, Amazon won't let me reply. But here's my answer: It's odd that this is mentioned in the specs and I wonder if it might have applied to the phone when it was initially available. I use Android Auto regularly. Generally, it works fine, with occasional quirks (e.g., it won't initiate text messages, it reads then deletes messages I've received). I don't know if this is the app or the phone, but restarting the app usually cures it. It does consume a lot of power, especially Google Maps, so I keep the phone plugged in when running it.Now, for the GPS. Last week, it was pouring rain. My wife was driving with her Motorola phone running Waze. I was in the passenger seat with the Unihertz Jelly running Google Maps. I watched while my phone repeatedly lost contact with the GPS. A few seconds later and it reconnected, only to drop again. I attributed that to the cloud cover, but my wife's Motorola never lost contact.The next week, while driving on the interstate in clear weather, the GPS kept moving me onto side streets while Google Maps told me to make a u-turn. However, my phone has been dead on during my runs, except for running in the rain, when it got lost in the woods.The bottom line is that the GPS is much, much better, but it's not perfect. That may be a lot to ask for such a small phone. Still, I'm generally quite pleased.