How to update my iPhone to iOs 4?

A friend of mine just gave me their old iPhone that they no longer use anymore and the software needs to be updated to the iOs 4.0. Can I update it through the settings? If so, how? I'm at my friend's house and my iPhone won't stay connected to her laptop because the cord sucks so I can't update it through iTunes. Someone please help! Thank you in advance! The model number is 327432XCVR0 just in case you need it. I believe it's the very first iPhone Apple ever came out with.

Iphone 3 and below can't be updated to 4.0 and you also would need a cord that connects to the computer to do so.

Go to setting then general it should say software update. Make sure your on Wi-Fi tho!

Any iphone thats older than 3g can't be updated past IOS 4 and since yours is the first I don't think it can go past IOS 2 or 3. Sorry. You should get a new iPhone

Recently, my friend update his iPhone to iOs 4. He was supposed to tell me that he did this with the help of itune software.So, you need to install that software and than update your phone.

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