Hey There,
Sorry it took so long to respond, I have been on vacation. Took my son to Disney
As for the iPhone apps, some of them are free, and some cost money, the best way to see if what you need or want costs money, get iTunes and an iTunes account and check out what is available in the app store. Those will be all the Apple approved applications. As for the unapproved apps that are available for jailbroken phones, most of them are free, although there are a few that cost a little bit. Installing apps is very easy, pretty much everything is done on the phone. Themes and skins are one of the best features of the iPhone. all of the images it uses are .png format, so image quality is much better and we can use transparency effects. Also, we can use webkit html in the backgrounds to do things like change the wallpaper based on the time of day, or show the current weather conditions right on the wallpaper. As for sound quality...... its an iPod, the #1 MP3 player in history, it sounds great!
Let me know if you want to get one, and I can help you get started modding it
