Just announced, OneDrive has increased their free storage size again. Microsoft is increasing their 15GB free space to 30GB for all users of iPhones, Android, and Windows Phone users. The one change is that 15GB is for your camera roll pictures and 15GB for other documents. So all of you with a new iPhone take advantage of this "limited" time offer and save yourselves some money if you were thinking of upgrading your iCloud account.

https://blog.onedrive.com/you-can-now-get-30-gb-of-free-storage-with-onedrive/