Apple released iOS 7.0.3 update a few weeks ago. Now, Apple has started to roll out the iOS 7.0.4 update for iPhone, iPad and iPod touch. This update is mainly concerned with the bug fixes and other improvements.
Apple has fixed an issue that caused FaceTime calls to fail for some users. The update also brings a fix for an issue where app and in-app purchases could have been completed with insufficient authorization.
Along with this, Apple has also released the iOS 6.1.5 for the 4th generation iPod touch that brings the fix for FaceTime issues and the security update.
Along with the iOS, Apple also refreshed the iBooks and iTunes U apps. The applications have undegone a complete design overhaul and the UI is in line with the look of iOS 7.
Users who are on iPhone (4 and above), iPod touch (5th generation) and iPad 2 or above and are running on iOS 5+ can download the OTA (over the air) update of iOS 7.0.4.
Go to Settings >> General >> Software Update. Then tap on Download. After the download is completed, tap on Install. Another way to update to iOS 7.0.4 is via iTunes.