Yes, it works on my 7290 w/ 4.0 installed. After I installed it, my TCP settings were wiped out. Had to reset them and then reboot the BB again.
Here is the settings I am putting in the TCP option: APN: wap.cingular
Username for APN:
Password for APN: CINGULAR1
We do have a BES but it is not 4.0 at this point, so I don't think the BES impacts VeriChat, but I could be wrong. We do not have MDS running either.
Hope you get it working as it is pretty slick. If you leave VeriChat running it hits your battery pretty hard.