Will the Focus S support VVM on AT&T? I really want to switch carriers from T-Mobile, but I really want to have VVM still. Is there any info on if/when ATT will support it?
Last I checked, Mango enables VVM, but it's up to the carrier as to whether or not it's used. I believe AT&T stated it is working on providing VVM for Mango devices. This article discusses it.
I am not sure I like the idea of VVM. Just recently, I had to switch from one phone which totally died to another, and I had critical voicemail which I understand would be totally lost if you had VVM. Seems like a bad system currently.
Just use Youmail (and by extension, the MagikMail app in WP7) for your Visual Voicemail. It works on all platforms and you'll never lose a voicemail again.
VVM, as implemted by Apple at least, was basically just IMAP-based behind the scenes. AT&T always had it tied to the SIM instead of to the phone number, so when you switched SIMs you were SOL with your messages. However, moving a SIM from one iPhone to another preserved your messages I believe. Since, as I said, it's just IMAP tied to the VM system.