My BB sensed a magnet in the holster and behaved accordingly.
The position of the magnet counts.
The crap holsters didn't work half the time, the BB screen stayed bright while in the holster, and drained the battery.
Often.
No belt clip, but it kept the earphone hole and camera lens from filling with gunk in my pocket. I wish they would put some care into that with flip phones, but they seem to get grungy just as fast as chicklet phones.