Hi,
I installed the trustvpn app and checked. I think I can make a better app because trustvpn is supported only on a limited number of devices and I can create a new app that works on all android devices. I am familiar with the UAE networks Du and Etisalat and have worked a VPN app for UAE recently which works both on Du and Etisalat. I can provide an app that works in UAE within a week. For Iran and China I will need some help in testing. If there are other apps that work in Iran and China then we can capture the packets and find out what they are doing.
Please ping me to discuss further.
Thanks,
-Vinod