Nigeria, June 4 -- Nigerians knew little about Mike Adenuga's lifestyle until a recent picture surfaced, and he preferred it that way.

The billionaire, also known as 'The Bull' in Nigeria's business circle for his resilience, has successfully kept his life away from the public. However, this picture offers a rare insight into his routine.

The picture posted by Reno Omokri, a former presidential spokesperson, on Sunday, announcing his visit to the business tycoon, gives fine details about the life of Nigeria's 'quiet' billionaire.

Mr Adenuga is the owner of the country's second-largest mobile phone network.

The billionaire, who has established himself in the telecommunications and energy sector, prefers privacy over showmanship.

The t...