I am not a mac user, but I did come across this resource that looks like it may make the process easier.
From what I understand using a mobile bradband usb modem that uses your cell phone can be a chore to set up, this software boasts that it automates the process by auto configuring settings.

Read more about the product here: http://www.novamedia.de/index_e.html

Hope this helps.

--

Dan La Bate
Creative Director & SEM - Engines of Creation.com
http://enginesofcreation.com


Phone: 518.842.3242
Fax: 866.643.4125
dan@enginesofcreation.com