Steam's revamped mobile app is available for everyone on Android

Valve is rolling out a redesigned Steam app for both Android and iOS devices. It has a more desktop-like experience with your game library and information, as well as a new setup for logins based on QR codes.

Steam's new mobile app looks way, way better - The Verge

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The new and improved Steam mobile app is now available for download on Android and iOS

Steam finally has an updated mobile app for iOS and Android

Steam Support :: Steam Guard: How to set up a Steam Guard Mobile Authenticator

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Update] I've been redesigning the Steam mobile app in my spare time : r/ Steam

Steam's revamped mobile app is available for everyone on Android and iPhone - The Verge

Steam Support :: Steam Guard: How to set up a Steam Guard Mobile Authenticator