Questions about OnePlus Nord 2T

The specifications state that the smartphone has three (rear) cameras, but the pictures only show two. What is correct here?

My device had a flat battery when I received it, and I couldn't even start it up without having to connect it to the charging cable. Do I have to worry? In all these years, I have NEVER had a mobile phone that did not have at least 30-40% battery remaining after purchase. This can cause storage damage, or am I worrying unnecessarily?

Do you have 5g with swisscom? (swisscom was very annoying in the past regarding OnePlus and did not release the devices or only very slowly). In the swisscom shop they even had the cheek to claim that the "OnePlus Nord 5g" does not have 5g :-/

Hello all. I bought the Nord 2T for my wife and can't find a menu item to enable WiFi calling. I have the 'older' Nord and I can activate it there. We use digitec connect and have very poor Sunrise reception at home. I can bridge this with the older device wonderfully with WiFi Calling. Is this not supposed to work with the new one? Can anyone confirm this function with the Nord 2T?

Does the box include a phone case?

Is the memory of the Nord 2T expandable?