FBI: Whereabouts of Clinton phones would 'frequently become unknown'
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Hillary ClintonHillary Diane Rodham ClintonHillicon Valley: Trump's exclusive interview with Hill.TV | Trump, intel officials clash over Russia docs | EU investigating Amazon | Military gets new cyber authority | Flynn sentencing sparks new questions about Mueller probe READ: President Trump’s exclusive interview with Hill.TV Keeping up with Michael Avenatti MORE used at least 13 mobile phones while secretary of State, many of which cannot be found, according to an FBI report released Friday. 

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Top Clinton aide Huma Abedin told the FBI the former first lady often replaced her BlackBerry.

It wasn't uncommon, she said, for Clinton to use a new BlackBerry for a few days before switching it out for an older version "with which she was more familiar." 

The sim cards to old devices were disposed of by aides, but the whereabouts of the devices in question would "frequently become unknown" once she transitioned to a different device. 

The FBI on Friday released a detailed report on its investigation into Clinton’s use of a private email server, including the summary of its three-hour interview with the former secretary of State, now the Democratic Party's presidential nominee.

An aide told the FBI he recalled two instances where he destroyed Clinton's old mobile devices by breaking them in half or hitting them with a hammer. 

The investigation revealed Clinton used 11 email capable BlackBerry cellphones associated with one of her known phone numbers, and eight of those devices were used while she served as secretary of State. 

Clinton used another two email-capable devices associated with another of her known phone numbers after her tenure, the report said. 

When the Department of Justice requested 13 devices as part of the investigation, they were unable to be located. 

"As a result, the FBI was unable to acquire or forensically examine any of these 13 mobile devices," reads the report.