Corrections spokeswoman Terry Thornton said Wednesday that guards found the phone Jan. 6 at Corcoran State Prison.
Manson previously was caught with a phone in March 2009. He had been calling and texting people in California, Florida, New Jersey and British Columbia. He had missed calls from Arkansas, Indiana and Massachusetts.
Thornton couldn't immediately say who he'd been calling this time, nor how he got the phone.
Manson is serving a life sentence for killings including the infamous murders of actress Sharon Tate and six others in Los Angeles in 1969.
He faces a disciplinary hearing and could lose early release credits. The Legislature plans to consider a bill making inmates' possession of phones illegal.