Can I sell my at&t iphone on ebay?

I see phones on ebay that say "unlocked" do I have to do something special or can I just sell my iphone & the new owner can just activate it?

Is using a debit card safe on amazon?

I'm kinda holding back on ordering stuff on there with my debit card, I'm looking for iphone 5 cases and in feel like it's not a good idea using a debit

Where can I download apps for iOS 4?

I'm using a jailbroken iphone 3g and I don't know how to get any apps that function on it. Cydia and AppCake are on there and it's running on iOS 4.2.1, but I'm struggling to find files that actually work

Added (1). There are basically no apps in the App Store that are backwards compatible with iOS 4, they all require iOS 5 or higher

Why do people like apple products such as iphones and macbooks?

IN terms of phones Androids are BY FAR the superior device and also why would you spend over $1000 dollars on a macbook pro when you can get a toshiba touchscreen laptop with 1000 gigabytes worth of storage for only $699? Seriously i would like to know.

How to transfer music from old iphone to new?

Most of it is illegal and not in my music library, also i don't want all the music in my library on my phone. I have tried icloud and manual backup both to no avail. I also want to transfer my pictures, notes, etc. (this is from iphone 4 to 4s)