HT4623 trying to 4.2.1 to 4.2.3 but I dont see software update. Can anyone help?

trying to 4.2.1 to 4.2.3 but when I go to settings, general, I dont see software update. Can anyone help?

There is no 4.2.3 and over-the-air updating was introduced with iOS 5.0.
You will need to connect your iPhone to the computer you sync with. When iTunes opens click on the name of your iPhone under DEVICES on the far left frame. Move to the Summary tab to the right and click on the Update button.

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