>>And who would she have been talking to without network coverage? <<
My group uses a “live streaming” (In early 21st century jargon) communication port running during our “visits”. I’m not really supposed to bring that up, but just as nobody noticed her until viewed with eyes that made sense of it, nobody will really notice what I am saying until the time comes (not in anybody’s lifetime contemporaneous to this post) where readers can correctly interpret this.
Oh, and yes our devices look like what you call “cell phones”, for technical reasons I don’t have the space to get into here.
I have ample space. I just don't have time.