If you think the Voice feature of the Yahoo Messenger! client is the best thing you can get, then I feel pity for you. Really, open your eyes! As far as I'm concerned, the client offered by the messaging giant is a really bad application, and I've been always using anything else I could find(Trillian and Pidgin, for most of my time) to connect to my YM friends. Now, even if you're only using the iPhone for messaging, there's no excuse left to stay away from Skype!

If you're asking why, then my only advice is to download Skype for your desktop computer or laptop, give it a try, and figure out for yourself. After all, the best way to find out how good is a product for your needs is not to read reviews and customer feedback, but try the thing and see how it feels and works for you and your own needs.
According to the official Skype website, there's a lot to be had from this great app. Just take a look below:
"Skype for iPhone delivers a true Skype experience: make free Skype-to-Skype calls and low cost calls to landlines and mobile phones – and participate in conference calls – from any WiFi zone. You can IM to your heart’s content, and participate in group chats too, whenever you have network connectivity, whether it's WiFi, 3G, EDGE or GPRS.
The user interface is everything you’d expect from an iPhone app, and it integrates with your Address Book for super low cost calls to friends, family and colleagues abroad. It also integrates with the Camera Roll and your photo albums so you can select a profile picture you love."
As its older users surely know, Skype comes for free, and it wasn't the case to change that on the iPhone platform. You can download it from the App Store and start talking right now! ;)
