Is there a VPN I could purchase and use on Flint while I am locating in China?
Sorry no.
Bypass China GFW is totally another skill.
ExpressVPN or TorGuard?
They won’t work well on Flint? I know ExpressVPN works well on their app.
I am about to travel to China and I would like to know if anyone has any recommendation on the best VPN to have?
Find a VPN provider that has VPN servers located in Hong Kong, such as PureVPN. Other VPN servers will likely be blocked by the Great Firewall of China. However, there are no guarantees.
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