IPhone apps/update? Am I doing something wrong?

I bought an iPhone 3GS off eBay second hand just to last a couple of months til my contract is up. Anyway I try to download any app be it twitter instagram whatsapp whatever and it keeps saying requires ios5 so I went to update my phone and it's fully updated and can't hold ios5 so does this mean I just can't download anything? Or ambi doing something wrong? The version I have is 4.2.1 if that's any useful information.

Did you go to: Settings-->General-->Software Update? I'm sure someone else will have a better answer to your question, but that is one way you can update your phone. The other way is to connect your IPhone to your computer and update it through ITunes. I hope this helps! And I hope you can update your phone!

Bad news sorry - 3GS won't run ios5 - best bet is sell it back on ebay and buy a iphone4

all your data should be safe (backed up to icloud)

IOS5 only suit for up to iphone 4

I it is a 3GS, you can upgraded it to the latest iOS via iTunes, But if it is really a 3G then 4.2.1 is the max. Finding compatible apps that are still available for vintage Apple mobile devices can be frustrating on iTunes.
To make this much easier try,
https://sites.google.com/site/appleclubfhs/support/advice-and-articles/finding-apps-for-older-devices
or
https://itunes.apple.com/...?mt=8&uo=4

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