ViBe is a very simple, but also fiendishly clever, idea. Usually when you put your phone on silent/vibrate it's because you're entering a situation where it's not appropriate to be constantly taking your mobile out of your pocket to answer calls. However, you may still need to know who's calling you.
ViBe allows you to assign different vibration patterns to different numbers, so you can tell who's calling you without having to actually look at your phone's screen. There's a choice of ten different vibration patterns built into the app and although some of them are quite similar after a while you'll find it fairly easy to tell them apart. You can assign vibrations to individual callers, or groups of callers such as friends, family and work colleagues.
ViBe is very easy to setup and once you've started using it you won’t want to live without it.