Any software to restrict data connection to 3G areas?

[hirowla]

Just wondering is there any software or configuration available to restrict data access to 3G zones? The reason I ask is that my provider includes data inside 3G zones in my cap, but charges a fortune when I roam into GSM/Edge areas. I'd like to prevent data access when I wander into those areas, to avoid any nasty surprises!

Any ideas?

Thanks.

[armedmetallica]

I'd be interested in this as well. I would want to poll for my non-push emails and other data updates ONLY within a 3G confined space.

My reasoning is because of the limitation on non-3G for receiving calls (and text) while a data "Call" is activated.