I have also noticed that phenonomen, it bothers me that my cell phone is so close to my heart and stimulating me like that. 

I have answered it many times, only to find no one is there, and it is spooky.

I used ot worry, but several of my friends have mentioned the same thing.

I wonder if it is someone else's phone nearby ringing, and I get the residual energy?

That is one reason I take it out of my pocket and leave it on the nightstand when I sleep.