HT4972 i have a iphone 3gs and i want to update my IOS but havent got software update on my settings?

can anyone please help me to update the OIS on my iphone?

The ability to update from the iphone itself is only available with iod 5 and above.
As you have ios 4, you will hae to update as always.
Turn on computer.
Open itunes
Connect iphone
From teh article you linked from:
If you are attempting to update using a Mac or PC with which you normally sync
You may see the following iTunes message:
Follow these recommended steps before updating your iOS device:
Transfer purchases3 to your computer.
Back up your device by syncing it with your Mac or PC first."

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