Yes, yes, but it is already in the meta-data: Even if the patient drives to Mom's house after getting voice mail - in which case there will not be the next call but there will be meta-data regarding the location of the patient's cell phone.
This is just no true - if I buy a used car and then call somebody to tell him that I just bought a black Audi A6 there is no (easy) way you can figure out these details from metadata alone.
How can there be meta-data of location of patient's cell phone, but not data of patient's cell phone? What is that which "data" is that "meta-data" the "meta" of?
It's the timing and individuals and the sequence of events which matter.