How can I use a T Mobile phone with a Virgin Mobile account?

I currently have a Rumor 2 with Virgin Mobile, my screen is cracked and cannot buy a new phone yet. I have an old blackberry curve & have heard that some people unlock it to use with other companies; how do I do it for Virgin Mobile, or is it even possible at all?

Thanks.

You need to unlock it and then swap simcards in Blackberry Curve. I suggest you can approach unBBlock.com and specify the country,locked network of phone.Based on the availability you can get the permanent unlock service along with free instructions.