i tried and was unsuccessful... i was even able to get the regular unlimited text plan and still doesn't work
Mine works great but I'm not on an iPhone plan. My company provides me with a WM phone and we all have a shared corporate Enterprise plan. I just take my SIM out and use in my iPhone instead of my Blackjack 2. Applying the AT&T 5.0 .ipcc gets MMS working with a simple reboot of phone. I do not have visual voicemail however. It has never worked for me since I'm not on an iPhone plan though.
My wife and son are on a seperate family plan and I can't get MMS working for either of them.