Jolla will be launching new version of the Sailfish OS this quarter, aimed for 4G-enabled feature phones. You could try that. I'm currently using Sailfish OS 2

Jolla will be launching new version of the Sailfish OS this quarter, aimed for 4G-enabled feature phones. You could try that. I'm currently using Sailfish OS 2.1.4.14 on my Intex Aqua Fish and the experience so far (last 1.5 years) is so good that I've decided to never use Android phones in future. (Brief - No home and back button wasting your time, just have simple gestures to navigate to different menus etc.) PS: Sailfish OS can also run almost all Android apps. https://jolla.com/sailfish3/ https://jolla.com/sailfish3/