IPVanish is one of the very popular VPN providers with world-wide customers. Their main website, ipvanish.com is currently blocked in China. If you want to sign up from China, you might have to use a VPN service to visit their website, or you can sign up from a country where it’s not blocked. However, once you’ve signed up and downloaded their VPN client, you can use IPVanish’s service from China without further problems. IPVanish claims to be the “only true tier-1 VPN service in the world”.