It's their wavelength,Funky -- they are too otherworldly for their atoms to be captured on a mobile. 
Also, in fairness, if you left out all the times, on every Mn 'woo' thread, that the 'ghost story' was
(a) obviously bollocks (Tristan and Molly and the camping pods, which was obviously a beginning creative writer who hadn't considered the logistics of her plot)
(b) the hearsay ones that the OP wasn't present for, but which definitely happened to their sister's dogwalker's mother's milkman's manager
(c) the ones that happened when the OP was a young child, or that involve young children talking about imaginary friends, being scared by a nightmare, something seen on TV, a story etc
(d) the ones that happen when the OP is falling asleep or half-awake, including all the ones that are obviously sleep paralysis/hypnogogic or hypnopompic hallucination
(e) the ones that involve the OP spooking themselves because they are alone in a new house whose ordinary night sounds they aren't familiar with, or alone in a distant storeroom/basement etc at work
(f) the ones that involve the OP desperately wanting to believe that their dead relative is sending them feathers or robins or causing certain songs to be played on the radio or missing objects to reappear
(g) the ones where the 'haunting' is fairly obviously a matter of malfunctioning electrics/draughts/creaky old floors
(h) the ones where the OP has been primed to see a ghost, because it's a famously haunted building where the ghost of Anne Boleyn runs screaming for her life down the gallery, or a workplace where all the employees talk about their spooky experiences on corridor X
(i) the ones where the OP misinterprets something well-known as a haunting, like the Mn thread where someone swore she'd seen a vision of silent horsemen in oldfashioned uniforms charging down Oxford St, only for several posters to point out that the Household Cavalry regularly bring their horses along there early in the morning on their way from exercising in Hyde Park.
-- there's not a lot left! 