Hello, I have difficult time to figure out how to get more vibration to set for some video calls. As you can know is that I am deaf so the problem is that most video call application like Tango, Fring and Qik Video tend to have set off by one vibration. I want to feel more vibration so I can answer the video call. I have Cydia application on my iPhone 4S and maybe if any of you know how to do it like giving me instruction by step to step. Thanks.