Wlan Telephony ( Telefonie ) not stable

Hi there, i am using /e/ OS on Fairphone 3+ and i am very happy with it.

I do have two SIM- Cards in Germany and i experienced, that having LTE enabled, the phone drains my Battery very fast (asking collegues, that affects other devices too).

Mostly i am staying in places, where i do have wlan. In those places, it saves a lot of battery, when i disable LTE. I am using flight mode for this and reenable wlan manually. Usually my phone will still receive calls, because wlan telephony is connecting automatically. So there is no need to drain the battery there.

Unfortunatelly, i am also experiencing, that wlan get deactivated sometimes by the phone without me changing anything. It does not seem to have anything to do with power saving-mode. Obviously there will be no calls be receivable anymore and also no more other connections like messengers.

When i press the button to activated the phone, wlan will be activated again even before unlocking it and without changing flight mode or anything.

So how can i disable the poweroff of wlan in /e/ os?

Further questions:

  1. I would like the phone to automatically switch LTE/GSM on or off depending on the state of the availability of wlan telefony. If i am in range of WLAN and have Telefony established with it, the LTE shoul dbe disabled. When i leave the wlan, the LTE should be enabled again. Is there any way to do so?

I have found no solution, searching for that problem in the net so far, which suprises me, because the factor of battery drain ist really huge (my phone will be down after one day, while using only wlan, it will stay active for three days or more!) and so i would guess, that all android based devices are wasting a lot of energy worldwide.

I would expect that feature to be a major feature of phones. Do i am doing anything wrong here, or why is nobody caring about this?

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