Along with the new image sending functionality, the update brings the usual set of performance improvements and bug fixes. It also enhances privacy settings and slightly tweaks the visuals of Skype for iOS.
If for some reason you are still not using Skype, you should know that it allows you to call (or voice call) and message your contacts for absolutely free from both a mobile device and traditional computers. Skype is a free, so it wouldn't hurt giving it a shot.
- Download Skype for the iPhone and iPad on the App Store [iTunes link]
source: Skype via GSM Arena