Worried about losing all the contacts saved on your iPhone? No problem! Periodically back them up on an Excel chart. How? Using this ultra-simple and above all totally free App! "Address Book Excel" is an App that allows you to export contacts from your iPhone into an Excel (XLS). With a single click, the App generates a file (showing name, surname and the first three phone numbers) and allows the user to send it by email or to a DropBox (Folder: iPhone_Contacts). It's easier than it sounds! Once generated, during the opening phase on some operating systems the Excel may generate a notification, simply ignore it and you will be able to open the file without any difficulties. NB. You cannot open the Excel chart directly on iPhone or other iOS devices.