When you send or receive mail to or from someone in Gmail, a record of that person's name and email address is made in Gmail's contacts list so that you can quickly refer to people you've contacted.

Gmail's contact manager lets you add and edit contacts' telephone numbers, which can then be synced with your Google account. The "+" prefix is used in international telephone number formats to show ...

Forbes contributors publish independent expert analyses and insights. Davey Winder is a veteran cybersecurity writer, hacker and analyst. Update, Jan. 25, 2025: This story, originally published Jan.