[voxadam]

You could use a regular COTS wifi router running OpenWrt and tether your phone to it, instead of tethering directly to your computer. This would give you a network functionally indistinguishable from one that uses DSL, cable, or fiber as an upstream connection.

[oelmekki]

Good idea, thanks, I didn't think about OpenWrt.

I initially checked if there was any possibility for my spare router (a d-link dsl-3782) to connect to my phone's wifi and then allow other devices to connect to the router, but it had no such feature (plus, if I got that correctly, you would need two wifi cards for that, one which would be in access point mode and one that will connect to other access point).

My router has an usb port, so it may just be that I could use it to flash the software, install OpenWrt, and then share phone connection with router through usb. Worth the try. (and sounds like a lot of fun :P )

EDIT : sadly, that model is not supported by openwrt.