I have seen a lot of people saying they have problems with the 2 finger double tap not ending or answering a call or that it's hard to find and double tap the answer, decline or end call buttons when they are in a noisy place. If you are jailbroaken or you are willing to jailbreak, I have a solution for you. I understand it's not for everyone, but if you are interested, read on. First, install Activator from the default repos. Then, ad http://cydia.rob311.com/repo to your Cydia sources. Next, from the source you just added, you need to install 3 packages. They are: HelloActivator, GoodbieActivator, and DeclineActivator. After you have installed these 3 packages and resprung, you can open up your settings app and go to Activator or double tap the Activator icon on your home screen if you have it set up to show the icon. Then you can set up Activator gestures for answer, end and decline a call. Note, if there is one or more of those buttons you don't want an Activator gesture for, just don't install the package corresponding to that button. Obviously, HelloActivator for answering a call, GoodbieActivator for ending a call and DeclineActivator for declining a call. I have not tested this with FaceTime calls, but I see no reason why it would not work. If you find it only works for the phone and not FaceTime, please let me know and I will remove the iPad and iPod Touch tags.