OneDrive (previously SkyDrive) is a cloud storage service by Microsoft. OneDrive apps are available to Windows, Android, iOS, Mac and also Windows Phone users. OneDrive provides 15 GB free storage to anyone who signs up.
 You will get 500MB of storage for every friend who signs up to an account through your reference. You can get up to 5 GB more free storage by referring friends.
 You can get an additional 3 GB free storage space by activating your mobile phone’s  camera roll backup to save photos automatically on OneDrive.
Sign up to get 15 GB on OneDrive.
Refer friends to OneDrive.
Activate camera roll backup.
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