I have upgraded my treo 270 with the Gprs upgrade following the instructions of TreoCentral. All finished well, the restore too (I use windows XP).
The gprs works fine. I have a sim from Omnitel Vodafone.
I have tried with both a rechargable sim and a contract sim.
All works perfectly.
It seems more faster if I do not specify the new dns of Omnitel Vodafone.
If you need it the new and correct DNS is:
From Omnitel the Gprs navigation is free of charge till 22/9 but seems that will be free at least till january 2003.

I am now looking for a good web browser that supports frames and an email programs that check by itself periodically for new mail. Anyone can tell me wich programs are the best for these needs?