I guess I do not understand this Londonderry ping thing very well. Does it mean that Maura's phone had to be within 22 miles of the tower, or it could it be that only the person calling her has to be within 22 miles?
If we are truly talking about pings, then it would be Maura's physical phone. that is what pings are used (by law enforcement for). Tracking an individual down (by their phone's physical location).
If I killed someone two hours away from my house, and I was questioned by police about where I was during such and such hours and I tell them I was at home. They can subpoena my cell phone records and use the ping information to verify if I was either at home like I said I was or if my phone was pinging off a cell tower close to where the person was killed at during the time that person was believed to be killed.
That is what cell phone pings are about. that is what interests police about cell phone activity.
Back in 2004, if you turned your cell phone off (in most cases) your phone could not be traced vie pings. The second Maura turned her phone on back then, she would've left a trace somewhere which showed (within 30 miles) of where she physically was at the time her phone was on. She did not have to be using her phone, it just had to be turned on.
But in 2014, most to all cell phones are traceable vie pings whether they are on or off.
What james is talking about, who knows?