The use of historic cell site evidence doesn't require it to pinpoint
the exact spot where the mobile phone was used. The evidential
supporting materials do have to stack up though but at the same time
avoid assumptions being made on "thin" evidence.
Circumstantial evidence - mobile phone /giffgaff / cell site:
http://www.bailii.org/cgi-bin/markup.cgi?doc=/ew/cases/EWCA/Crim/2013/1916.html
Location and Mast Usage
http://www.bailii.org/cgi-bin/markup.cgi?doc=/scot/cases/ScotHC/2013/2013HCJAC89.html