A student in Namibia has invented a phone that does not require a sim card or airtime to make calls.

The boy, Simon Petrus, is a grade 12 student (equivalent of SHS 3) at the Abraham Iyambo Secondary School in the Ohangwena Region of the country.

According to a local news website, he put together the parts from an old television and a telephone and says the invention only uses the radio system. It also has an electric light bulb, a fan and a socket for its charger, attached to the large box it is housed.

Simon Petrus has become a household name in the southern African country for his many designs. Last year, the youngster won a gold medal at a national science competition.