Tethering an Toshiba AT100 to a Nokia E71
Try bluetooth tethering instead.

Benefits: Consumes less power, you can leave bluetooth enabled 24/7. Works out of the box.
Drawback: BT 2.1 may cap your maximum UMTS speed (usually not an issue on the go).



There are two profiles for this to tether via bluetooth:  


Bluetooth PAN:
Supported by Android 3.0+ out of the box. See Wikipedia entry for more info on PAN profile.  
Bluetooth DUN:
Needs 3rd party app like BlueVPN (ICS version here). See Wikipedia entry for more info on DUN profile.


Stock Android 3.0+ and custom roms like CM should support Bluetooth PAN. Your Nokia E71 supports only DUN profile (Archos users can enjoy added DUN support out of the box however) .