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does not necessarily mean that a call was made. It can also be the result of the phone being switched on again," the sources said.
Fariq and Captain Zaharie Ahmad Shah have come under intense scrutiny after the plane mysteriously vanished.
Investigators last month indicated that the flight was deliberately diverted and its communication systems manually switched off as it was leaving Malaysian airspace.
The probe into the missing plane have been focused on four possible areas - hijack, sabotage, as well as personal and psychological problems.
The FBI has been assisting police, including sharing intelligence and expertise.
Police have not cleared the 227 passengers of the flight MH370 of possible foul play. Clearance has also not been given to the crew.
The mystery of the missing plane continued to baffle aviation and security authorities who have so far not succeeded in tracking the aircraft despite deploying hi-tech radar and other gadgets even after searching for 36 days.