Yes, definitely. One SIM card on the left, the other SIM card on top together with the memory card in the same slot.

There are two possibilities, either use the phone's smartview so it does not need an accessory: https://publish.samsungsimulator.com/simulator/30f1b848-7471-4722-a44d-4eb6829240a8/#!topic/connections/smart_view or switch to a chromecast:Google Chromecast 3 This connects in HDMI on the TV and must be on the same Wi-Fi as the phone. Then from the phone it connects to the chromecast to duplicate the screen on the TV: https://support.google.com/chromecast/answer/2998456?co=GENIE.Platform%3DAndroid&hl=it

No, WiFi Calling is a separate feature and has nothing to do with Whatsapp calls. You can always use Whatsapp calls despite WiFi Calling.

You can also use a SIM card from the USA, works exactly the same as the CH card. :)

Import: Yes/No indicates whether the item has been imported or not. Imported devices have different prices and are usually delivered with an adapter. The reason why we have them in our assortment is mainly if the item is not distributed in Switzerland or if the availability of the Swiss product is very poor.