Why won't my Iphone show IOS 7 update?

I have iPhone 4S and when I go to software update it say I'm up to date but I know for a fact that its not ios 7
And my friend has same phone and already has the update.
What can I do I don't have a computer with iTunes
Should I just wait?

Added (1). I have already tried turning it off and on but nothing

Added (2). And btw my phone ain't jail broken
And I live in america

Restart it
And try again

I don't know maybe you jailbreak it or what. Try to restart it. If not try search the release date in your country.

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