There was an unconfirmed sighting of Amy at at bar, but as far as I can see, nothing came of it.
They have never doubted that Amy had the phone on her person that night.
The prowler / suspicious phone calls / stalker
This article in the independent tells of how Sion and Lois "lived in fear" of a prowler.
A statement given by family friend Peter Gaimster details an evening at the Jenkins residence (just four days before the girls murder) where Sion mentioned a prowler and showed him the extra security measures they had taken.
He said the family were so concerned that they even planned to move in the future.
This report mentions that in 1996 Billie-Jo had mentioned being stalked by a male in a leather jacketto friends. One friend, Ruth Bristow, informed investigating officers that several days before her murder Billie-Jo was so terrified that she didn't want to stay in the Jenkins home.
Despite their worries, their car being vandalized and a series of strange phone calls they had received, they had neglected to alert the police about the issue.
The M25 rapist Antoni Imiela
In February an article was published consideringAntoni Imiela, also known as "The M25 rapist" and "the summer rapist" may be a possible suspect.
At the time he was dating his future wife, Christine Ashenden, who lived around 2 miles from the Jenkins home. Imiela had been courting her for a while and was a regular visitor in Hastings by '97.
He was known to stalk his victims and lie in wait for extended periods of time before committing his crimes. Could he have been waiting in the park behind Billie-Jo's home on the day of her murder?
Was he the prowler the family feared?
Perhaps he saw her walking her dog every night after school and began to follow her and learn her routine.
As we can see in the picture of the back of the home, it looks very easy to access. (source)
The security lights that Sion fitted would have been rendered useless in the daylight.
Imiela was said to own and often wear a leather jacket similar to the one Billie-Jo described her unidentified stalker as wearing.