The forensic search expert looking for Nicola Bulley has said the case is one of the most "baffling" and "unusual" investigations he has looked into in 25 years.
Peter Faulding, who was brought in by Nicola's family, has suggested that the phone could have been positioned on the bench by the river as a "decoy", Wales Online reported.
"After 25 years of doing this kind of work, after hundreds of cases, I am well and truly baffled. Normally you would expect the divers to find them easily.