Is the ios7 for apple downloaded or bought?

I'm getting a new iPhone 5, and it gets here in a few weeks.however, apple's ios7 hasn't come out yet. My friend said that it could be downloaded, but i don't know from where (after it gets released). Do i need to buy it? And if so, where?

Would it be okay for me to keep my iPhone 3GS?

I know some of you may scoff at this lol but I love my iphone 3gs, it works well for me and it is still going strong for the couple of years that I've had it. Because Apple isn't selling it anymore and the egs won't get IOS 7, is it still okay to keep? I really don't like the other iphones to be honest:/

Added (1). I'm worried about it becoming obsolete.

How to give an app access to photos on iPhone?

I know you're supposed to go to your settings and then photos and turn the access to "on" but the app isn't listed in the settings at all. How to you give an app access to your photos when it's not listed in your settings?

What app can I use to cut music?

I have to make up a hip hop dance and I need to cut different songs and put them together then put them on a CD the app needs to be free and for a toshiba laptop but if you don't know any for the laptop then i have an iphone 5

How to watch movies on iPhone?

So I've been trying to watch the movie buried on my iphone 5 but don't know any good sites to watch it on and whether you can actually watch movies on an iPhone, can anybody give me any suggestions?

IPhone 5S going to get an iOS 7 Jailbreak?

As per Apple is going to release next-generation iPhone 5S next month. I'm really curious to know about the availability of iOS 7 jailbreak for iPhone 5S? Is there any update from prominent jailbreak hackers about getting iPhone 5S on board this time with iOS 7 public release?

What is Difference between iOS 7 Download service and iOS 7 Beta download?

While downloading the latest iOS 7 for iPhone 4, I have seen many pages around the web that are stating iOS 7 download as a separate service than iOS 7 beta download. So my question is, what is the real difference between ios 7 download and ios 7 beta download?

both are same software update or different?