First you must have an iPhone 4 or iPod Touch 4. If you do not have these models then you must jailbreak your're iPhone. When succeeded, you must search the app known as Cydia,(which will be available after you jailbreak). In the search bar, you should search FACETIME until you get the desired tweak or app. If you need more help contact me. Also, since you're iphone doesn't have a front facing camera, Apple won't give you the Facetime icon because of course they are strict would like you to buy one with a front facing Camera.Sorry. You're welcome.