Use iOS 7.1 beta 3 to delete unwanted OTA updates and save yourself a cool 1GB
But we digress. With iOS 7.1 beta 3, iPhone and iPad users have the ability to remove OTA updates that are collecting dust in your device. To delete those unwanted files, open the Settings application on your home screen. Tap on General > Usage. Look for Storage and tap on iOS 7.1 beta 3. Then, tap on Delete Update and you are finished. You just opened up about 1GB of storage space.
Keep in mind that this is available on a beta version of iOS and the feature might not make it to the final version of iOS 7.1.