Google Voice on the iPhone: What You Can't Do   We've got a
chart listing everything that works and doesn't work (click on
the image for a closer look), but here's the gist:  The Web app
version of Google Voice can be accessed at Screening and
forwarding works like a charm, and I was especially pleased to
see names and pictures show up in caller ID during incoming
calls.  Seeing as this is a Web app, you can't record your name
or custom voicemail responses. I understand this can't be done
in Safari, but I wish there was a way to set up a call with
Google Voice and record these settings over the phone. It's also
impossible to download voicemails for offline access, which is
probably more a limitation of the iPhone than anything else.
Some options are inexplicably missing. For instance, you can't
write or read notes appended to voicemails or calls. You also
can't block specific phone numbers or change your own Google
Voice number. Worst of all, contact management isn't nearly as
robust on the iPhone. You can't