You need a SIM card on Galaxy S20 if you want to connect the phone to a mobile network for voice, or data, or both. Of course, you can use Galaxy S20 without a SIM card (you can use WiFi/Bluetooth/USB for connections). But it does not make sense to buy a Galaxy S20 if you plan to use it without a SIM card. You can get a WiFi-only tablet at a far cheaper price. This … [Read more...] about How to use and manage SIM card on Galaxy S20?