HT4623 I tried to install the Facebook app on my iphone. It says I need ios 4.3 or better. My phone has 4.0.2 (8A400) What do I do?

I tried to install the Facebook app on my iphone.  It says I need ios 4.3 or higher.  My phone has 4.0.2   How do I up grade to 4.3 or better?

In first logout ur apple id in iphone or ipod and then Open iTunes in computer and with apple Id download facebook and withsame id open login in ur iPhone then it will download automatically
                           (or)
Do same in any device which containing ios4.3.3 then login in ur iPhone

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