The sources said the FBI team was also facing some problem in breaking into the encrypted code of the Gramin GPS phones but since the company was headquartered in the US, they would be able to break it using the master key code of the instrument available with the company.
Both the FBI and the Scotland Yard Police have taken details of call records apart from finding out the longitude and latitude positions of the mobile phones used by the 10 terrorists when they were raining bullets on Mumbaiikers.
Samples of the explosive material and the timer used in the detonation of the Improvised Explosive Devices were also taken by the two foreign investigating agencies for examination.