I have a business voice plan.  After using the T-Mobile OTA configurator
for my T39m, I have both "Internet" and "GPRS" connection profiles.  
After configuring my ISP email account, was able to gain POP3 email
access.   This worked for a week or so, but I now get a repeatable "GPRS
parameters not supported" error.

Was the access a fluke?  What's required to get consistent access?

Thx.