Unless I am expecting a call about something medical with family or mechanical with the car, I am trying to get to the point where I let unknown callers on my cellphone just go to voicemail. It's harder to just let it go when it's a local number because I figure it's someone I know, then I am usually wrong and it is just some sales call.
So I finally did it with this call. My phone rang, I was busy. I just let it go to voicemail. I listened a few hours later. "Hello, Brother [OTWO], this is Sister [Jane Doe]. (Must be 80-something years old.) We went to pioneer school together (11 years ago). I was going through my phonebook and saw your number and thought I would just call and say hello. Call back if I have reached the right person."
My cell has my voice with a generic, "You have reached 123-555-5555, leave a message and I will return your call." So if you hadn't spoken to me in a decade, you would not be sure you reached the right number.
My point is pretty clear. JW's are like many other firm believers. If you look for an incident/coincidence to be more than that, you will find what you need. If I told my JW wife or mother about the call, they would go on and tell me how Jehovah is working through [Jane Doe] to call me back to active Witness status. Kind of like sending JW's all over the frigging world to knock on doors and then finding a few instances of people saying they were just praying for some kind of help that morning when the knock came.
I do not intend to return the call.