The Konka U3 takes a lot of inspiration from phones of the early 2000s, and that's immediately apparent in its clamshell design. Hinged halves protect the main 2.4-inch screen and extra-large keypad from accidental contact when stored in your pocket or bag, and you don't even need to open the phone to answer or hang up a call – the top half features a smaller 1.77-inch screen for displaying caller information and the current time, plus there are physical call buttons on the face for managing incoming calls. Alternatively, you can configure the U3 to automatically answer as soon as you flip it open, saving you from fumbling with buttons and accidentally rejecting an important call.
Accessibility is core to the U3's design. Nowhere is this more apparent than on the back side of the phone's bottom half, where there's an SOS button for requesting assistance in the event of an emergency. Holding the SOS button down for three seconds will fire off an SMS to the numbers you've designated as emergency contacts (up to a maximum of five) and then proceed to call each one in turn. For folks with medical conditions or those who spend a lot of time in hazardous environments, this feature can be a literal live-saver.
While the Konka U3 is built for simplicity, it does pack a few extra features beyond its basic call and SMS functionality. A multimedia player allows you to listen to music and watch videos stored on the device, though you won't be able to load the U3 up with all that many files out of the box given its limited 128MB of internal storage. If you want to expand this, the U3 supports microSD cards of up to 32GB in size. Alternatively, the U3 includes an FM radio for tuning into your favourite station. Whichever form of entertainment you prefer, you have the choice of listening through the built-in speaker, by connecting wired headphones to the 3.5mm audio jack or by syncing a pair of wireless headphones over Bluetooth.
In keeping with its traditional design, the Konka U3 features only basic network connectivity. There's no Wi-Fi support, and mobile network compatibility is limited to 3G. This has minimal impact on calls or texts but does mean significantly slower speeds when using mobile data. Of course, while the U3 does include a barebones web browser, it's not intended for any sort of serious surfing. However, should you plan on tethering the U3 to another device over USB and sharing its Internet connection, those slower 3G speeds might be more of an issue.