[CedarDave]

Probably got his phone’s unique IMEI at the FedEx office from a roaming signal and were then able to track based on subsequent roaming signals. Since they had the suspect, his phone, and video confirmation in one place, they could then look for where that IMEI showed up (cell tower roam logs).

Are you saying that the Fed's can get a record of all roaming signals and those phone's ID from the FedEx office at the time he dropped off the package even if he didn't use the phone? And then get info on the individual phones and by means of elimination zero in on the bombers phone?

[Natty Bumppo@frontier.net]

Unless your cell phone is powered off with the battery and any external power supplies removed, or it is locked inside a Faraday cage, anyone can do it.

[RitchieAprile]

http://www.crypto.com/blog/celltapping

[CodeToad]

“Are you saying that the Fed’s can get a record of all roaming signals and those phone’s ID from the FedEx office at the time he dropped off the package even if he didn’t use the phone?”

Yes. Your phone and the cell towers constantly ping each other to know which tower should send or receive singles to and from your phone.

[Deaf Smith]

Ever use your phone to see traffic patterns (slow and or stopped traffic) to plan your route?

That is thousands of phones sharing their GPS movements in the area that you are looking at.

[bgill]

They probably got his car tag from when he parked at the FedEx and did a search of his registration, then his driver’s license photo and that lead to getting his phone.