Cheap LG K20 now available on AT&T
Resembling the LG K20 Plus (available on T-Mobile and MetroPCS) and the K20 V (sold by Verizon), AT&T's LG K20 sports a 5.3-inch display with 720 x 1280 pixels, and is powered by a quad-core Qualcomm Snapdragon 425 processor. The smartphone further offers a fingerprint scanner, 16 GB of internal memory, microSD card support, 8 MP and 5 MP cameras (rear and front), and a 2800 mAh removable battery. Weirdly, AT&T's K20 only has 1.5 GB of RAM - we have no idea why LG didn't include 2 GB of RAM (like on the K20 Plus and K20 V).
The LG K20 currently runs Android 7.0 Nougat, and might be updated to Android 8.0 Oreo at some point (although there's no official word on this yet). If you want to buy the phone from AT&T, you can do it online via the source link below.
Update: It turns out that AT&T's K20 is exactly the same device that Cricket Wireless (an AT&T prepaid brand) is selling under the name LG Harmony.