I have a note 10+ but not 5G, if it was I wouldn't upgrade yet. The S22 Ultra came 2 days ago & I still haven't switched over yet. Few years ago I'd of started switching over within minutes of getting the new phone. The phones screens are about the same size but the ultra is definitely thicker.
With a WiFi connection in the right countries you should be able to use wifi calling. With WhatsApp & a WiFi connection you will be able to talk & text