I believe there is, yes. I gather it's to do with the speed of light and the device's ability to answer within the correct TDM slot. I think from memory it's around 35Km for 2G, which unfortunately doesn't provide a very narrow search radius :(

https://en.wikipedia.org/wiki/Timing_advance

It seems what they really need is to borrow one of those Stungray devices from the NZ police ;)

(ref: Hunt for the Wilderpeople movie)

Pete

On 21/07/2016, at 12:00 pm, Travis Baird <travis@unifone.net.nz> wrote:

Is there a cutoff distance from the tower that the device will no longer be able to connect (e.g. if there is this helps narrow the search area at least)?