I just want to buy a Linux laptop with VoLTE and be done with the product line "smart phone". Unfortunately there is no such device (to my knowledge) and the only device that comes close is PinePhone Pro with docking station.
Agreed. I always loved the idea of the HTC Mini +.
Put the sim in your laptop, that's the connectivity hub.
The mini phone piggybacks the LTE connection so you don't have to pull out your laptop for simple calls, texts, navigation or music actions.