With Huawei smartphones, it can happen that incoming calls are automatically terminated when you accept them or that during a phone call the connection is simply interrupted.
The background for this is usually not visible at first glance, but often it is due to the so-called Voice Over LTE setting.
This is because when VoLTE is activated, the behavior described above is noticeable with some network providers. If the mobile network is poor in the LTE band, the smartphone switches back to the UMTS band.
During this change it can happen that the connection is interrupted. The telephone call is simply ended.
Our tip is therefore if you often have to struggle with the above mentioned behavior:
Disable VoLTE if there are connection problems with the Huawei smartphone
1. open the Huawei Smartphone settings
Select "Mobile Network".
Select "Mobile Data",
For SIM 1 (or Sim 2), disable VoLTE calls.
This means that on your Huawei Smartphone a call is no longer handled via the LTE network, but immediately via the UMTS network. Due to the missing network change no more problems and errors should occur.