Open the app and connect. Some apps allow you to choose servers and use tweaks. To make sure you get the right file, let me know: amtunnel config files for Mobilis specifically? Is your device Android ? APNA TUNNEL LITE - Apps on Google Play
Another popular option from the same developer. Download mobilis tnl
These apps often require a specific .amtunnel or .mltunnel configuration file tailored to Mobilis network settings to work. Open the app and connect