The great developers and testers at sdx-developers came up with two version of Froyo using VM USA Froyo release.
1.
Rooted Froyo ROM for those who previously upgraded to Sprint Froyo 2.2
For Sprint baseband, DL05 or DF27
2.
Stock Froyo ROM based on latest VM USA
A few people tested this and reported that MMS and Voice Mail notifications working again.
Virgin Mobile Froyo 2.2 StockROM, kernel, and other stuff. *Ok GO! Fixed!*
Please read in detail and decide for yourself.