My3G is a very old tweak of Cydia, it being developed many years ago when FaceTime it doesn't work through 3G, and various applications restricted functions when a user browsed the Internet using a Wi-Fi connection. In the meantime, many things have changed, but applications such as YouTube it still refuses to display videos in HQ format on 3G/4G connections, and this is where the tweak comes in My3G. Using this tweak, now compatible with iOS 7, you can "fool" any applications that you are actually using a Wi-Fi connection and all its functions will be available without restrictions.
My3G is available in the repo BigBoss al Cydia, but it works based on a license that costs $4.
