The update addresses a major issue with FaceTime calls
It's been less than a month since Apple released the iOS 7.0.3 update and the company is now pushing live another update, which is meant to fix some issues brought in by previous iterations of the platform.In this case, Apple is patching a major issue with FaceTime calls that fail for some users on iPod touch (4th generation). Apple also notes this update features “security content originally included in previous iOS Software Updates.”
9to5mac reports Apple has also released iOS 6.1.5 update for iPod touch 4th generation, which is meant to fix the same FaceTime bug on the non-iOS 7 capable iPod touch.
As usual, the update can be downloaded OTA (over the air) through the Software Update area in the iOS Settings menu. Hopefully, this one won't bring other issues to iOS users.