While serving as Secretary of State, "t was not uncommon for (Hillary) Clinton to use a new BlackBerry for a few days and then immediately switch it out for an older version with which she was more familiar," the FBI said. (AP File Photo)

(CNSNews.com) - The FBI says its investigation identified "13 total mobile devices" associated with Hillary Clinton's "two known" phone numbers, both in the D.C. area code 212.

All 13 of those devices "potentially were used to send emails" through Clinton's personal email server, but the FBI was unable to acquire or examine any of those devices, at least two of which apparently were smashed by a hammer.

Here's how the FBI describes Clinton's need to use 13 mobile devices, most of them BlackBerrys, one after another:

Monica Hanley, a former Clinton aide, often purchased replacement BlackBerry devices for Clinton during her tenure at State. Hanley recalled purchasing most of the BlackBerry devices for Clinton from AT&T stores located in the Washington, D.C., area.

(The FBI noted that Justin Cooper, a former aide to Bill Clinton, was usually responsible for setting up the new devices -- transferring data from the old device to the new one and syncing the new device to the Clinton's private email server.)

Abedin, (redacted) and Hanley also assisted Clinton with setting up any new devices. According to Abedin, it was not uncommon for Clinton to use a new BlackBerry for a few days and then immediately switch it out for an older version with which she was more familiar.

Clinton stated that when her BlackBerry device malfunctioned, her aides would assist her in obtaining a new BlackBerry, and, after moving to a new device, her old SIM cards were disposed of by her aides.

Abedin and Hanley indicated the whereabouts of Clinton's devices would frequently become unknown when she transitioned to a new device.

Cooper did recall two instances where he destroyed Clinton's old mobile devices by breaking them in half or hitting them with a hammer.

The FBI stated in its report that one of the "investigative limitations" was its "inability to obtain all mobile devices and various computer components associated with Clinton's personal email systems."

This "prevented the FBI from "conclusively determining whether the classified information transmitted and stored on Clinton's personal email systems was compromised via cyber intrusion or other means."

Here's the excerpt from page 9 of the FBI report: