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(Image: Screenshot by Matthew Miller)
Automatic activation means that DriveMode launches when you move faster than 25 mph. When DriveMode is on, all calls will be sent to voicemail while texts and emails will get auto replies telling people you are driving. You still have full control on whether or not these auto replies are sent, so don't worry that it is spamming people. You can edit and customize the message that goes out with your auto replies, too. Up to five phone numbers can be listed that can be called while moving as well.
In the upper left there is an icon for 911 so in an emergency, you can also still make that important call. The idea of DriveMode is great.