Reported on SiliconValley.com, this guy feels vibrations in his leg near where his phone normally is kept, even if his phone is not there, like a phantom vibration. Freakily, I have experienced this a couple of times as well! Several times I have thought my phone was ringing (vibrating) I’ve put my hand in my pocket and found no phone…. not often, but enough that I could recognise this straight away. Should I worry?