Few places not on poll – Finland, Sweden, Norway (waggle hands vaguely), Iceland, Greenland (OK, Inuit generally don’t do raves), Turkey and the other parts of the Middle East, all of China and Mongolia. And Laos, Cambodia, Vietnam, Thailand, Burma, Nepal, Bhutan, Singapore, Indonesia.
Some would argue Tibet too. Oh, Antarctica and the South Atlantic. Also orbital astronauts.
I’d draw the line at people arguing they’ve currently been abducted by aliens and are in intersteller space. Not that’s impossible (although highly unlikely), it’s just they wouldn’t have WiFi access at that distance.