TTL Editor is a free Android app, developed by Kirn Gill, which allows you to set up a network configuration rule that edits all IPv4 packets leaving over a given interface to a specified value. This can be useful for hiding tethering or mobile hotspot usage if you aren't paying for it. The app is a simple graphical frontend to a feature of the Linux iptables system, and it does not change any files. All configuration changes will reset upon reboot.

Please note that this app is still in beta and has bugs, but it may be useful to some users in its current state. To use TTL Editor, you need a working 'iptables' binary and kernel support for Netfilter TTL packet mangling for your kernel (xt_HL.ko). The app requires network access permission to get a list of the various network interfaces on your device, and their associated IP addresses. Root access permission is necessary to actually perform the TTL packet editing. The app also has a "start on boot" function that requires permission to work.

If you encounter any issues, you can mail a logcat to the developer. The source code is available on GitHub, and you can follow TTL Editor on Facebook for more updates.