App works on someone device. 
However, there is slight difference, there are phones which on their mobile connection was able to display their ip while on others is not as thesame case, below the are screenshots of phone which it connect and unable to connect, I also indicated by shading it with a red color where the ip displayed and not and I believe that should be the reason why freedom vpn could not connection some phones. 
Meanwhile a phone that could display the mobile ip will be able to connect.