Although iPads can download apps made only for iPhone/iPod Touch, the iPhone can only download iPhone or iPhone/iPad apps. Apps made only for the iPad do not appear on the App Store. Luckily most of these apps have an iPhone counterpart such as Angry Birds (iPhone) and Angry Birds HD (iPad only).
download them from the apps store
Download installous on iPhone (In the IPhone Store)
There is an App Store on every iPhone. You download them from there (:
easy ''If you download it its no charge''
YES!
You can go to apple.com and download iTunes
definitely NO, and if you want a lot of cool free iphone apps, use iAppWorld.net
Yes you can as long as your iphone is connected to the same itunes account you bought the apps on.
using the iappworld.net iphone application available on the appstore for free
On your iphone go to the home page and click on the app store here your will find hundreds of thousands of apps just click on the one you want and click the download button.
to jailbreak an iphone means that you can download apps that used to cost money for free.