How to upgrade my iPhone 4 to version iOS 4.3?

Please help me to upgrade my iphone4 to version iSO4.3

On the computer you normally sync your phone with run iTunes. Connect your phone to the computer.
Select your phone in iTunes.
Select General or Summary in the row of tabs that are presented.
Scroll down to find Check for Update.
Click on that and you will be guided through the process to update. Your phone will be updated to the most recent version of the iOS that is compatible with your phone.

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