In addition to the coverage area, the new agreement between MTN and Cell C incorporates the terms of the first agreement signed in May 2018, which provided for the roaming of Cell C on MTN’s 2G, 3G and 4G networks.
According to MTN, this deal is part of the development strategy of its wholesale business. The telecom operator believes that this collaboration, which can support the development of the national telecom sector, is profitable for both companies
Source: http://nextvafrica.com/cell-c-and-mtn-signed-an-expanded-roaming-agreement/