Finally, Google will have you confirm one last time that you want to use 2-step verification. Press Confirm, and you're all set to go.
There's always a catch...
There is a catch: If you use any of Google's services through Apple's Mail, Calendar, or Contacts apps on iOS or OS X--or through the Mail app on BlackBerry or Windows Phone--you will need to "reconnect" your apps and devices to your Google account. This will let you generate special app-specific passwords so you can still log into your Google accounts through other apps.
How you reconnect your apps varies some depending on the apps you use, so we won't get into too much detail here, but when prompted, press Reconnect my apps, and Google will step you through the process.
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