Is there an app that will make my (jailbroken) iPhone vibrate when a call is answered?
Solution 1:
As someone who is involved in some iPhone developing, I can tell you that you can’t do that with the official SDK, so unless you find another Jailbroken app, there’s no “official” way to do it.
Solution 2:
Get Phone Buzzer from Cydia, it works brilliantly, and its free.