This is more a note to self than anything else, as there are many posts already on the internet about this.
Recently I’ve needed to get mail on the road, and my employer’s policy forbids to connect a non-standard device to their network. So, a GPRS connection through the phone is an OK alternative. Nothing as the 3G connection I used to have in the United Sates, but it is OK. My provider is China Telecom, but the instructions here work for any other provider.
- Pair the Treo and the Mac, if you haven’t already do so. The Bluetooth Setup Assistant should do everything required. Just follow the steps. Choose “Mobile Phone” as the type of device

- Check the services on the newly added device. When selected on the Bluetooth panel, the Dial-up networking service must be present

- Go back to see all the control panel modules, choose Network, and now you should have a Bluetooth connection (if it wasn’t already present). Add a new configuration for your service provider - handy if you travel a lot

- Now fill in the required login information. For China Telecom, account and password are guest, check this page if you don’t know the correct info for your phone provider. Bear in mind that data rates are expensive if you don’t have the appropriate plans.

- Click on Advanced. In my case, the Treo worked fine with the Generic script as shown below. If not, find out what works for your phone. For instance, for a RAZR V3xx I used in the US, Ross Barkman’s scripts worked well, as mentioned in a post some time ago.

- Finally test, try to connect.

Hope this post helps someone else. If you have other suggestions, please leave me a comment.