Hasn't worked in China -- on iOS -- for a long time – Astrill VPN Client Review

Their desktop/Android apps work great, but their iOS support has been pretty bad in the past, and hasn't worked for quite some time. Talking to support may get you a solution that works for a few hours, but nothing long lasting. It's an issue with most providers -- and a problem even if you roll your own -- but if you're coming here looking for something that does work on iOS, look elsewhere.
Review by rilez.dj on Astrill VPN Client.