In the Channel 4 First Cut documentary '
Missing Claudia Lawrence' aired in August 2010 (link below), SC says at 15 min 40s:
"I still call her phone now and then and I end up leaving a message".
Given what we know about CL's phone - it was switched off manually on 19/3/09 and presumably the battery would have died within a couple of days - how was it possible for her voicemail system to still function in this way?
Also, one wonders if this process would have emitted a signal?
Finally, does it give us any clues about whether it is less likely the phone was disposed of in water or concrete if it was able to function in this way?
Do we have any telecomms experts on WS?