@uhunkler: You could try the open-source app WaveUp. It wakes up your phone by waving over the proximity sensor (located at the top middle-left of the FP2 screen) (called “wave mode”) and also has a “pocket mode” for turning on the screen after having taken the FP2 out of your pocket. For more detailed information, please consult the project site https://gitlab.com/juanitobananas/wave-up.