Your phone going “dark” during an action is in itself a signal that you are involved in the action. Especially when it deviates from your phones normal activity

Your phone going “dark” during an action is in itself a signal that you are involved in the action. Especially when it deviates from your phones normal activity patterns. It would make more sense to leave your phone on and at home. However, you can’t use any of the tools the articles lists if you have no phone.