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plug your iphone into your computer and go into itunes click on your phone under devices go to summary and press check for update or update iphone.
Plug it into your computer and iTunes will open automatically. If you don't have iTunes download it from apple.com. When iTunes opens you will see under devices your iPhone name will be there. Click that and then press check for update. If there is an update available, download it.
You need to connect to to the computer that is authorised for your iPhone and update via iTunes.
I don't believe the iPhone 3G can update past 4.2.1, but any newer iPhone can update the same way you normally update an iPhone through your iTunes authorized computer.
Update the software in iTunes and it will do it for you.
Using the usb cable it comes with you connect it to your computer and open iTunes. From there click "Update" and it will download and install the newest iPhone OS version for you.
Sync it to iTunes.
What you do is you go and plug up ur iPhone to the iTunes and click on the update button
Sync your iPhone to iTunes on our computer
Plug your 'i' device into your computer/laptop and go onto itunes and it should say that there is an update.
Just plug it into a computer with itunes and find the update button within itunes. It should come up on a screen saying that a new iOs is available would you like to update!
Click on 'Update' in iTunes!