It's interesting that other electronic devices have been implicated in hauntings - a recent
Horizon programme on neurotheology reported that...

"PERSINGER: In certain situations electromagnetic fields are being generated that overlap at what the brain normally generates. Certain individuals, if their brains are sensitive, their brains can interact with these fields to produce all kinds of powerful, very meaningful, experiences that can be called a god, or a haunt, depending upon their interpretation.

Talk about quietude!

So we walk about the house trying to find out where the areas are that may be the sources of the signals. Usually the people tell us on the basis of their experience, they'll say: "This is where it happens."

NARRATOR: Initially the readers the team found were inconclusive, but then they noticed a clock radio in the girl's bedroom.

PERSINGER: We went over and measured and we found that she slept near a clock, and we measured the clock, and the clock had a particular, unusual pattern to it. It was the same basic pattern that we were using to generate the presence in the laboratory. The clock was removed, the phenomena itself terminated."

Mobile phones emit quite complex patterns of electromagnetic radiation with a mixture of many different (and to some extent changing) frequencies. It is certainly possible to envision these changing the electromagnetic environment to the extent that a different pre-existing field no longer had an effect.

R