The phone was initially due to go on sale in October but its launch was delayed "because of an explosion in demand," he said.
Though the phone is Congolese by design, it is manufactured in China. It costs about 130 euros ($170) -- a considerable sum in this central African nation.
The phone has a 3.5-inch touchscreen, 512 megabytes of RAM and a 650-Mhz processor. Its camera is five megapixels, and it also comes with GPS and Bluetooth.
Mankou last year designed what was billed as Africa's first tablet computer.