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
Alternative source to download the XAPK/APK file directly. Key Details for Setup Download mobilis tnl
Another popular option from the same developer. Open the app and connect
Download the app, and if using an XAPK file, you may need to enable "Unknown Sources" in your Android settings. and if using an XAPK file
These apps often require a specific .amtunnel or .mltunnel configuration file tailored to Mobilis network settings to work.
A fast, free VPN often used for network tweaks.