Lock My Phone for Study ZEN MODEdevice lock is a free Android application developed by Thomas Kahn under the category of Business & Productivity. The app's purpose is to help users stick to their routine by locking their phone during specific periods. The app requires Device Administrator permission to function correctly.

While the device is locked, users can still access apps on the lock screen, make phone calls, and call emergency numbers. The app features recurring lock periods, which is useful for locking the phone every evening during the week after 10 pm. There are also one-time lock periods, which is helpful when you want to concentrate for a specific time, such as 45 minutes while studying. Moreover, the app has a Geocheck-Feature, which only locks the device if the user is in a specific area.

The free version of the app allows only one lock period in total, either one-time or recurring. The premium version, which has no ads, offers unlimited lock periods of both types. Users can learn how to set one or more of their contacts as emergency contacts with Android's ICE-feature by following a tutorial provided by the app.