SIMBA mobile network is built using the 4G technology which means voice calls can only be made using VoLTE capable handsets supported by our network.
There are many handsets in the market that are 4G capable but they may not be VoLTE capable. Currently, VoLTE capable handsets supported by our network are listed here.
We encourage customers with handsets not listed to download SIMBA 4G Voice App to make and receive calls on their SIMBA mobile number.