Is it possible to update iphone using IOS 4.2.1. to ios 5 or 6

hey guys am trying to download applications like whatsapp on my iphone or games like  c andy crush but am not being able as its saying that its not compatible with this iphone so i was wonderibg that if its possible to upgrade my iphone using ios 4.2.1 to an ios 5 or 6. when am trying to do this on itunes its saying that my phone is already updated with its latest version. so can anyone help me out. thanks

If you really have iphone 3gs, then you can update it further.
If you have an iphone 3g, then you cannot.
Identifying iPhone models - Apple Support

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