I am also using bold and I am using DSTcom as well. I am able to surf internet, receiving email without blackberry data plan.
First, u have to upgrade your blackberry firmware from blackberry website. Once upgraded, you will get additional setting option on APN under 'advance option'
With APN set, you will be able to surfing internet using opera mini or bolts. And for email, I am using tiggit mail. It works perfectly
If you need more guidance, please do not hesitate to sms me at 8727121