These are the best and worst mobile networks in South Africa Subscribe MyBroadband Insights has published its Q1 2021 Mobile Network Quality Report, showing that MTN has the best mobile network in South Africa. The report is based on 349,575 speed tests that were performed by thousands of MyBroadband Speed Test App users across South Africa between 1 January 2021 and 31 March 2021. The research shows that South Africa had an average mobile download speed of 33.23Mbps and an average upload speed of 12.71Mbps. MTN had the highest average download speed at 64.29Mbps, followed by Vodacom on 32.76Mbps, Telkom on 27.83Mbps, Cell C on 20.82Mbps and Rain on 10.58Mbps.