I set up a new prepaid card on my N900 today. I started it off on the Sidekick plan.

If I use epc.t-mobile.com as my APN, I can browse within their walled garden. However, I can't connect to my OpenVPN server at home.
If I use hiptop.t-mobile.com as my APN, OpenVPN works great, and I'm able to use the workarounds listed on other threads to fix my default route so all traffic goes over the VPN. Unfortunately, if my VPN isn't connected, I can't get to *anything* - t-mobile.com, t-zones.com, and web2go.com are all blocked.

My general plan is to stay on payg unless I need data, so the VPN won't be an option most of the time. I'd prefer not to have to switch the APN back and forth when I do need data (though I guess if I'm already going to the trouble of changing my plan, changing my apn isn't a huge deal). Anyone else run into this? Any solutions?