A 77-year-old Nicosia resident was arrested on Monday in connection with the 14 mobile phones found last week inside a fridge in the central prisons.
The phones, found alongside 12 charging cables, were allegedly smuggled in for use by prisoners.
Three men aged 63, 51 and 47 already in custody are believed to have played a role in transporting the devices, while authorities are investigating possible inmate involvement.
The discovery
