Two of the highest seeling iPhone applications include Text Lingo and Angry Birds. See 'related links' below.
There are 15,000 Applications!
Almost all of the applications on the iTunes store is compatible with the iPhone 4. Exceptions are applications which are for the iPad.
Yes.
There are many iphone applications to track calories in food. Weight watchers is one but dieting is based on opinion, therefore everyone will have their own favorite application.
There have been many great app websites to pop up in the last few years. Among the best are Amazon's and AppBrain. Phandroid is also a great site for android apps. And check out appsafari for iPhone.
iPhone applications are individual applications that do different things. Developers from across the world design and implement applications to do things like edit pictures, connect with friends, etc. The majority of applications are games, whereas others are utilities. See 'related links' below.
The iPhone is most likely the best VOIP phone. It is the best phone in almost every respect, and surely in this as well. Also, the iPhone offers an app store with a pervasive superfluity of commodious applications and programs, one of which is bound to be designed for voice-over.
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No
One of the top rated weight loss applications you can use on an iPhone is the Lose It app by FitNow. Here is a direct link that shows you screen shots of the apps and a list of features; http://itunes.apple.com/us/app/lose-it!/id297368629?mt=8.
The iPhone is probably the current best of the smart phones because it has way more applications than the others, is more intuitive and user friendly, and is constructed by Apple.
Both YouTube and Truveo have dedicated iPhone video applications.