Step by step - selling 3G for 3GS

[jerbajabber]

I need some help.

I want to sell my iPhone 3G and purchase an iPhone 3GS while keeping the same number, and preferably all my contacts and data.

Do I have to unlock the 3G before selling it? Do I have to swap out the SIM cards?

Can I still unlock the 3G after activating my 3GS? What happens to old iPhones after a new one is activated for the same AT&T account?

Is there any way to sell back an old iPhone to AT&T/Apple?

I would appreciate help in figuring out what process I need to follow to do this. I am sure many other people on this forum will benefit from this thread as well.

 

[Lenxal]

If we could sell our stuff back to people then everybody could have a 3gs

 

[Revelation78]

I need some help.

I want to sell my iPhone 3G and purchase an iPhone 3GS while keeping the same number, and preferably all my contacts and data.

Do I have to unlock the 3G before selling it? Do I have to swap out the SIM cards?

Can I still unlock the 3G after activating my 3GS? What happens to old iPhones after a new one is activated for the same AT&T account?

You'll want to unlock your 3G before upgrading, not absolutely necessary but, I've never had issues doing it this way.

Is there any way to sell back an old iPhone to AT&T/Apple?

NO!

I would appreciate help in figuring out what process I need to follow to do this. I am sure many other people on this forum will benefit from this thread as well.

Do a complete wipe, unlock and sell it. Discard the sim card in the old iPhone, the new buyer wont need it and the new iPhone will come with one.