So I guess we're calling this clue the "Londonderry ping." Sounds good to me.
Some people have been wondering if this call that came into Maura's cell phone the afternoon she went missing, the call that "pinged" the Londonderry tower, could have been Maura checking her cell phone. When you check voicemail on some cell phones, the phone literally calls itself. Mine is like that.
However, the way I read the search warrant, it appears they were trying to identify the person who owned the number that called Maura. Obviously, they would have recognized Maura's cell phone number. It seems it was either logged on her bill (that would be the bill that goes to her boyfriend Billy Rausch's mother) as a number that they could not put to a name or an "unlisted" number that could be provided by the cell phone company logs.
If it was merely Maura checking her cell phone, this is still significant information. The phone could only have pinged the tower if it was within 22 miles. There's a photo above, showing the area. If it was Maura, she wasn't traveling up 91 N like we've assumed. She would have likely been traveling up 93 N, which begs more questions, like, could she have swung by Hanson or Weymouth before heading into the North Country?
My hunch is it was not Maura checking her phone. I think it came from the person she was meeting up there.