He forwarded some information that seemed as if it was going to be helpful. When
the Dash, with WM6, is tethered with USB, it is recognized (as eth1; the driver
is mdis_host, the MAC address is 80:00:60:0F:E8:00, and it has an IP). When
surfing is attempted, it loads one or two Web pages before it slows down and is
unable to fetch any more.

Or try wvdial? I attempted to construct wvdial.conf from information given at
another site:

[Dialer Defaults]
Modem = /dev/ttyUSB0
Baud = 115200
Init1 = ATZ
Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0 Carrier Check = no Stupid Mode = no
Phone = *99#
Username =
Password =
New PPPD = yes ISDN = 0 Modem Type = Analog Modem

There's no /dev/ttyUSB0, however. And it's not recognized.

I don't seem to have Bluetooth dongles lying around, but I ordered one. That's
another approach that is sometimes used.