If you are a new user of SmartThings or ADT | SmartThings, please download the new “SmartThings” app instead of this “SmartThings Classic” app.

SmartThings lets you monitor, control, and automate your home from anywhere in the world. To get started, simply purchase the SmartThings Hub, download the new “SmartThings” free app, and add as many connected lights, locks, sensors, and devices to create a smart home that matches your unique personality.
From version SmartThings Classic 2.17.0:
We've been hard at work making the SmartThings app better for you. This version of the app includes bug fixes, stabilization, and continued improvement of Samsung Account migration.
Variant
Arch
Version
DPI
(Android 4.2+)
Latest: 2.17.0 on September 29, 2018
All versions
September 29, 2018
February 3, 2018
December 29, 2017
December 15, 2017
November 14, 2017
October 30, 2017
October 3, 2017