How to update the software on my Apple iPhone 3GS using iTunes

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You can update the software on the Apple iPhone 3GS to the most recent version using iTunes. Keeping the software up-to-date can help fix issues and give you new features.
In this example, we've used iTunes v10.7.
1. On your computer, start iTunes.
2. Ensure your Apple iPhone 3GS is connected to iTunes.
3. iTunes will automatically search for software updates. If prompted about a newer software version, click Download and Update.
4. Click Next.
5. Click Agree.
6. iTunes will download the software update.
7. The software update will then be applied to your iPhone.
8. The iPhone has been successfully updated.