Local charity Lifeline has teamed up with phone company 8ta in an attempt to tackle the growing rat infestation in the area known as Alexandra.
Although once home to Nelson Mandela, the cramped living conditions and illegal rubbish dumps in the area mean that it's now an ideal environment for rats to breed.
City officials have distributed cages, and residents have wasted no time in cashing in their furry loot.
One local resident Joseph Mothapo, who has already won two phones, told South Africa's Mail & Guardian: "It's easy. You put your leftover food inside and the rats climb inside, getting caught as the trap door closes."
He added that he plans to get a phone for every member of his family.
However, the PR stunt hasn't gone unnoticed by animal activists, who have taken to social networking sites to criticise the initiative.
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