HT4623 i have a iphone 4 icannot update my phone

i selected settings-general-about- but no software update and i cant update to get  ios ,please help me

If you have iOS 4... See Here >  http://support.apple.com/kb/HT4972
OR...
Connect to iTunes on the computer you usually Sync with and “ Check for Updates “...
If an Update Appears Install it... if not... you are up to date for your particular Device...
See the Using iTunes Section Here...
How to update your iPhone, iPad, or iPod touch

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