I think that ubuntuforums link is going to do the trick. Turns out I had wvdial installed in (old) Ubuntu already, so I did the settings and configs according to that link and it seems to be working. I'll know for sure later this evening. B)
Thank you to all who responded.

Lee

P.S. Boost is owned by Sprint.

Well, I got on, but it's slooooow and I get the following:

Contents of boost,bak:
# This optionfile was generated by pppconfig 2.3.18.
#
#
hide-password
noauth
connect "/usr/sbin/chat -v -f /etc/chatscripts/Boost"
debug
/dev/ttyACM0
460800
defaultroute
noipdefault
user "{phone number removed by mod}@sprintpcs.com"

ipparam Boost

sudo pppd
~ÔøΩ}#ÔøΩ!}!}!} }4}"}&} } } } }%}&ÔøΩRÔøΩÔøΩ}'}"}(}"VÔøΩ~~ÔøΩ}#ÔøΩ!}!}!} }4}"}&} } } } }%}&ÔøΩRÔøΩÔøΩ}'}"}(}"VÔøΩ~~ÔøΩ}#ÔøΩ!}!}!} }4}"}&} } } } }%}&ÔøΩRÔøΩÔøΩ}'}"}(}"VÔøΩ~~ÔøΩ}#ÔøΩ!}!}!} }4}"}&} } } } }%}&ÔøΩRÔøΩÔøΩ}'}"}(}"VÔøΩ~~ÔøΩ}#ÔøΩ!}!}!} }4}"}&} } } } }%}&ÔøΩRÔøΩÔøΩ}'}"}(}"VÔøΩ~~ÔøΩ}#ÔøΩ!}!}!} }4}"}&} } } } }%}&ÔøΩRÔøΩÔøΩ}'}"}(}"VÔøΩ~~ÔøΩ}#ÔøΩ!}!}!} }4}"}&} } } } }%}&ÔøΩRÔøΩÔøΩ}'}"}(}"VÔøΩ~~ÔøΩ}#ÔøΩ!}!}!} }4}"}&} } } } }%}&ÔøΩRÔøΩÔøΩ}'}"}(}"VÔøΩ~~ÔøΩ}#ÔøΩ!}!}!} }4}"}&} } } } }%}&ÔøΩRÔøΩÔøΩ}'}"}(}"VÔøΩ~~ÔøΩ}#ÔøΩ!}!}!} }4}"}&} } } } }%}&ÔøΩRÔøΩÔøΩ}'}"}(}"VÔøΩ~

Does all this gibberish mean I have something set wrong in the ppp configuration?

Contents of wvdial.conf:

[Dialer Defaults]
Init1 = ATX0
Modem Type = USB Modem
Baud = 460800
New PPPD = yes
Modem = /dev/ttyACM0
ISDN = 0
Phone = #777
Password = sprint
Username = {phone number removed by mod}@sprintpcs.com
Stupid Mode = on

Auto Reconnect = on

Carrier Check = no

sudo wvdial
--> WvDial: Internet dialer version 1.60
--> Cannot get information for serial port.
--> Initializing modem.
--> Sending: ATX0
ATX0
OK
--> Modem initialized.
--> Sending: ATDT#777
--> Waiting for carrier.
ATDT#777
CONNECT
~[7f]}#@!}!E} }8}!}$}%,}"}&} } } } }%}&}28#}6}'}"}(}":1~
--> Carrier detected. Starting PPP immediately.
--> Starting pppd at Sun Oct 18 14:26:33 2009
--> Pid of pppd: 4613
--> Using interface ppp0
--> pppd: xÔøΩÔøΩ[08][08]ÔøΩÔøΩ[08]
--> pppd: xÔøΩÔøΩ[08][08]ÔøΩÔøΩ[08]
--> pppd: xÔøΩÔøΩ[08][08]ÔøΩÔøΩ[08]
--> local IP address 10.23.6.2
--> pppd: xÔøΩÔøΩ[08][08]ÔøΩÔøΩ[08]
--> remote IP address 10.23.6.1
--> pppd: xÔøΩÔøΩ[08][08]ÔøΩÔøΩ[08]
--> primary DNS address 170.206.225.21
--> pppd: xÔøΩÔøΩ[08][08]ÔøΩÔøΩ[08]
--> secondary DNS address 170.206.225.22
--> pppd: xÔøΩÔøΩ[08][08]ÔøΩÔøΩ[08]

And of course when I logout:

^CCaught signal 2: Attempting to exit gracefully...
--> Terminating on signal 15
--> pppd: xÔøΩÔøΩ[08][08]ÔøΩÔøΩ[08]
--> Connect time 50.4 minutes.
--> pppd: xÔøΩÔøΩ[08][08]ÔøΩÔøΩ[08]
--> pppd: xÔøΩÔøΩ[08][08]ÔøΩÔøΩ[08]
--> pppd: xÔøΩÔøΩ[08][08]ÔøΩÔøΩ[08]
--> Disconnecting at Sun Oct 18 15:17:00 2009

I'd rather it be all clean on the screen! Is that some AT command?
What does that 'debug' instruction in ppp configuration mean?