News Hi-tech cell phones help Africans trade crops By Oluniyi D. Ajao - 5th July 2005 Daniel Mashva heaves his sack of cabbages and sweet potatoes into a rickety shared taxi and travels nine hours under the scorching sun to the market in Johannesburg. RelatedMetroFibre upgrades line speeds for South AfricansInflation hits poor and working-class South Africans hardest