I have personally used Mobian and PostmarketOS as a daily driver. The "Phone" aspect works pretty well (Calls, SMS/MMS, voicemail, VoLTE, no Wifi Calling). The base model Pinephone works fine for very basic tasks, but is very slow for anything else. I would assume that most of the other "mainstream" Phone distros have a similar/the same feature parity.

I personally have moved to a Librem 5 with PureOS, mainly since it is much faster, and I like the user accessible HW kill switches. I use it for "Phone" tasks, email, web browsing, 2FA, Telegram, Signal, the occasional camera picture, and Matrix.