Various aspects disclosed herein are directed to different types of personal assistant techniques for facilitating call event notation, tagging, calendaring, and etc., particularly those implemented on mobile communication devices. Users of mobile devices are provided with a relatively easy way to record and organize personal notes relating to one or more selected telephone conversations conducted by the user. Users can also manage notes, tasks, and schedule items related to the user's contacts and social network(s). In at least one embodiment, a Mobile Application running on a user's mobile device may be configured or designed to automatically detect an end of phone call event at the mobile device, and to automatically display a “pop-up” dialog GUI prompting the user to record a personalized note or other content (if desired), to be associated with the phone call which just ended.