Improved Phone Call UI (CHI 2014)


Mobile phones have evolved from communication devices to multi-purpose computing devices. However, smartphones still use full-screen notifications for incoming calls, which interrupt whatever activity the user was already engaged in. We propose new designs that allow users to postpone calls and also to multiplex by way of a smaller partial-screen notification. We report on a small-scale controlled lab study as well as a large-scale study in-the-wild. Our contribution is an enhanced interaction design for handling incoming calls on smartphones.


Matthias Böhmer, Christian Lander, Sven Gehring, Duncan Brumby, Antonio Krüger: Interrupted by a Phone Call: Exploring Designs for Lowering the Impact of Call Notifications for Smartphone Users. In: Proceedings of CHI ’14, Toronto, ON, Canada.

Android App

We implemented the findings of our research and released an app for Android smartphones. You’ll find it on Google Play.

New app AppDetox


Together with Lyubomir and Markus I released a new application to the Google Play Market. AppDetox helps you to calm down your mobile app usage. You are able to set your own rules for your app usage to detox from some heavy app usage and stop procrastinating. According to your own rules the use of some apps will be forbidden. You will see temptations when you tried to launch an app against your rules in a log.

appdetox_rules appdetox_your_apps AppDetox Screenshot appdetox_create_rule

Download it here or scan the qr code: