How can I record my iPhone's screen? [duplicate]

I don't believe there's a way to do it without jailbreaking. Because of the security restrictions on what apps can access, and particularly the limited functionality when running in the background, I'm pretty sure it's impossible without jailbreaking (and maybe even if you do jailbreak).

If you're looking to make a screen-cast or something similar, the technique I've heard is popular (at least with Adam Lisagor, who does a lot of iOS app videos) is using the iPhone simulator included with Xcode.

Since iOS 8 and OS X Yosemite, you can connect the iPhone to your Mac using the Lightning connector, and it will be available as a video camera. Then you can record video of what happens on the screen using QuickTime Player.

(Source: https://developer.apple.com/app-store/app-previews/)

With previous versions of iOS and OS X, you can use AirPlay mirroring on your phone and an AirPlay receiver/recorder like Reflector or X-Mirage.

You can use the Apple 30 pin to HDMI cable (meant for iPads) and hook it up to a Tivo. This will only work if your using an iPhone 4, no other iPhones will work with the cable.

You can use an OS X app like Reflector or AirServer to make your Mac simulate an AirPlay display. Then you select your Mac as an external AirPlay display on your iPhone. AirServer and Reflector provide features to record the output.

OS X 10.10 Yosemite has an iOS screen recording feature built into QuickTime.