A:AnswerIt means the phone is not predesignated to any phone company and is open to be used with most company's. Keep in mind, because it's not preset you might be missing some specific apps.
A:AnswerVerizon is a CDMA network and therefore does not use a sim card. You will have to get the new device flashed with your service informtion and this will have to come through the wireless carrier. You may be able to do this online with your device serial number/IMEI/MEID but check with them to be sure.
A:AnswerYes. I have the Galaxy S8 and use a Samsung wireless charger with qi printed on the label.
It also works with wireless charging in my friend's GMC Sierra and a wireless charger I purchased from Ikea.