Yeah, put it into Itunes and sync it with iphone
You buy music through the iTunes store and download it to your iPhone.
You have to convert the music into an ACC format than sync it to your iPhone
After you buy the music in the itunes store you have to sync it.
Yes, you have to have an iPhone to download iTunes to a phone
Download iTunes
you use itunes
Yes just download music
You can't you have download the free app bump and then bump music
if you can access itunes on your phone you can download music through there ,but if not you can use itunes on your computer , download them through there and synchronise your iphone with your computer.
You can not get Siri if you jailbreak a iphone 4. In order to get Siri you have to download the app.
No. It can use your 3g