My iphone 4 won't update to IOS 7?

I have enough space and everything. My friends have received the update and have already started installing it, but the problem is when I try to do it, it says my software is up to date.
Why is this happening and is there any way to fix it?

Why does my iphone 5 not find ios7?

I'm using Wi-Fi connection now even though my carrier is MetroPCS. But anyways, I clicked on general, software update and its been "Checking for updates" the whole time and hasn't found ios7

What will happen if I update to iOS 7?

I have an iPhone 4 which I have been told can update to iOS 7. But if I do, what will happen?

Will any of my apps be deleted or start over or something? Because I have this free music app-NOT illegal-that has all my music on it and I don't want it all deleted.

What about my pictures? Do I have to back them up first? What about my apps WITH pictures?

Notes? Calendar? Will it completely start over?

Will my apps be arranged the same or not? I NEED All THE INFO I CAN GET!

(Optional) can you please tell me how to update? I heard something about connecting it to the computer and updating the AppStore first?

How to delete everything I synced onto my laptop?

I synced over 1, 000 photos and music and everything from my iPhone 5, Now I want to delete all pictures I synced onto my laptop so I can sync new pictures on for iOS 7, please let me know how to delete the current pictures synced on my laptop.

How should I go about buying the new iPhone 5s?

Ok… My original smartphone died last year for no reason and for the past year I've been working with a 19 dollar GO phone. However, this past weekend I lost it somewhere in Hoboken and I live in Brooklyn. Anyway I was already planning to buy the new iPhone this week. I'm just wondering should wake up really really early on Friday and wait in line and if so should I wait in line at the Apple store or AT&T store. Or should I just order it online that Friday and hope it comes within a few days. However, I currenly don't have a phone and I don't know how much longer I go without one.

Also, if any New Yorkers could which locations maybe easier for me to obtain on Friday would be great!

How much to 'Pay Out' my mobile?

I'm looking at getting an IPhone 4S or 5, but the warranty on my phone now isn't up and I have to apparently 'pay it out' to keep my number etc…
I have a Galaxy Nexus (Samsung)

How much would it be to pay it out?
And
Which is better iPhone 4S or 5?

Should i download iOS7 on my iphone 4?

So i thought iphone 4 could not receive the iOS7. But turns out you need 2.8GB of storage to do it. I deleted some apps and got the storage and began downloading it. Then my brother told me that all of his friends that have an iphone 4 and has downloaded it has erased everything on their phone and totally screwed it up. Is this true? Will it happen to me? Mine downloading is still on the first step, if you think i should stop the download to save everything on my phone how can i do that?

IPhone 4 will not let me update IOS 7?

I've went to my settings and Update Software to update it, but it says it requires 667 mb and 2.9gb… So I've deleted over 10apps and ended up with 713mb and 5.7gb left… But it still will not let me download it… What can I do… I can't hook/plug it in a computer because I don't have one, just a phone. I have also reste my phone, but still no luck…