InstantCamera is a $0.99 jailbreak tweak available on the BigBoss repo, and it lets you access the camera from within any app using a simple Activator gesture. The fact that the developer charges $0.99 for this tweak, when another tweak just like it — a tweak called CamFast — is already available on Cydia free, baffles me.
In fact, both tweaks work exactly the same. Both use Activator gestures to invoke the Camera app API from anywhere, including your Lock screen. So why would you pay $0.99 for this tweak, when it’s already been available for free since last year? (...) Read the rest of How to use the iPhone’s camera without exiting the current app