How to update my iPhone 3GS iOS 4.3.3 to iOS 5?

I don't have a pc nor a Mac, and no I do not have access to any. So I need to do this ota. This is what I did… Went to "settings" then "general" my friend told me to tap "Software update " but I don't see it. I tried resetting my iPhone but that didn't work. I tried this with my battery on 100% btw. Any other way I could get the iOS 5 updated ota or anyway I could make the "software update" tab to show? Thanks for your helpful answers.(hopefully that are) :)

If you have an apple store or an apple outlet anywhere near you (ex. In a local mall) you can fill out a request at the genius department and they can help. Or you can try the geek squad at a local best buy

That is strange that the software update tab isn't in settings. I haven't used a 3GS before though, so maybe they didn't have that available on that model. Like was mentioned above, I would go to the Apple Store if you have one near by or Best Buy!