How do I resolve issues with calls being dropped on the iOS mobile client?

If the calls on your iOS mobile client are being dropped or you are losing the speech path, this may be caused by the iOS feature called Wi-Fi Assist.

This feature allows to make a switch-over form Wi-Fi to cellular data, and vise versa (switch to cellular data when the Wi-Fi signal is weak).

To avoid issues, please navigate to Settings > Cellular, all the way down to the bottom of the screen and disable the option Wi-Fi Assist. By doing this, you may also save your battery, since any change in the network connection triggers a reconnection to the Circuit Back-end.