A pop-up window will appear right above the system tray on every phone call. You will always see at least the telephone number in this pop-up window, but the more data you have about this caller/called, the more information will be shown. The displayable portions of the pop-up windows consist of the data fields (phone) number, first name, last name, company, address, city, country and profile picture.
If you want to change the duration of the pop-up, you can change its behavior in the Popup and Sound settings dialog.
