One week per year I want to connect my Powerbook to the internet using GPRS. In principle this is easy: choose the right modem script in the Network Preferences and fill in the provider details.
Unfortunately, the Modem Scripts that come with OS X are rather old. I tried the newest one (for a T39), but failed. I asked the Swisscom hotline for help, but they told me that they don’t support Apple Computers and directed me to the commercial solution from Novamedia.de (“Mobile High Speed” for €87).
Next time my Powerbook was connected I found the Modem Script site of Ross Barkman with all the Scripts I wanted and the important piece of information, that you need to enter the APN in the phone number field.
I had two options: a Swisscom Mobile SIM card and an Orangeclick SIM card. Once I knew where to enter the APN, the configuration was easy, but navigating the provider sites to find the Details is not. This is what I found (and what worked):