I have friends in Shenzhen who regularly walk across the border to connect to HK LTE just to get important work done. And their office has 4? different ISPs, s

I have friends in Shenzhen who regularly walk across the border to connect to HK LTE just to get important work done. And their office has 4? different ISPs, so I know it's a bad day on the firewall when they're working from HK.