Hide My Ass! (HMA!) is one of the very popular VPN providers with world-wide customers. Their main website, hidemyass.com is currently blocked in China. If you want to sign up, you might have to use a VPN service to visit their website, or sign up from a country where it’s not blocked. However, once you’ve signed up and downloaded their VPN client, you can use HMA!’s VPN service from China.