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The Department of Correctional Services says Christoff Becker, one of the Waterkloof Four, has been transferred to the Kokstad Maximum Security Prison in KZN.
Department spokesperson, Manelisi Wolela, said Becker was transferred from the Pretoria to Kokstad last week.
He said this was after officials found a mobile phone in his cell during a recent search.
In February, Becker and Frikkie du Preez were re-arrested after footage of them allegedly drinking alcohol and using a cellphone at the Kgosi Mampuru Prison emerged.
Their parole, for beating a homeless man to the death, had been revoked.
