No it is not possible. The Telecel dongle supports WCDMA network technology and Africom uses CDMA network technology. The 2 are not compatible so the Africom line will not work in the Telecel or Econet or Netone dongle.
You can try your luck with a Powertel dongle though. Powertel also supports CDMA so all you would need is to manually enter the Africom APN onto the Powertel dongle
