Xiaomi
Turn On/Off Call Forwarding auf Xiaomi
Call forwarding on Xiaomi phones is often preconfigured by your carrier for three situations: the line is busy, the call goes unanswered, or the phone is unreachable. In these cases the network reroutes the call, usually to voicemail, without any extra action from you. That is why calls can disappear from your call log even though the phone appeared to work normally.
You can check and change every forwarding rule yourself. Open Phone ➔ Open the Menu ➔ Tap on Settings ➔ Tap on Calling accounts ➔ Tap on Call forwarding. On a dual-SIM device, pick the SIM card the rule applies to first.
Inside, choose which condition to edit, then either enter a phone number to forward calls to, or tap Turn off to stop forwarding for that condition. Changes apply immediately and only affect the SIM you selected.
Turning off all forwarding options is useful if you rely on your own voicemail app or want missed calls to simply show up as missed calls instead of being redirected. Forwarding to another number is helpful when you expect to be unreachable for a while and want calls to reach a colleague or second device instead.

