Steps

1. connect your phone using a USB to your FreeBSD system
2. enable USB tethering from your phone’s settings
3. On your FreeBSD box the following msg pops up on the console:
   urndis0 on uhub4 urndis0: <RNDIS Communications Control> on usbus2
4. run ifconfig to see the new ue0 interface
5. get an IP address assigned to your system using dhclient ue0
6. Enjoy !!

https://forums.freebsd.org/threads/tethering.80705/