Hello, I have an iPhone 4, through which I view my Google Calendar via a CalDAV account. This works great, and my calendar stays synchronized between my iPhone, my Macbook Pro (via iCal), and the GCal web interface. Recently, a colleague shared his Google Calendar with me. He did this with in the actual Google Calendar website, so it is privately shared (not a public ical link), and shows up as a "delegate" of my main Google Calendar account. This works great in iCal on the laptop... I just go into delegates for my calendar, and check the box for his account, which shows up (read-only, as he specified). My problem is that I am now trying to also view his calendar on my iPhone 4, and it will not work. So far as I can tell, there is no way to access the main list of delegates via the phone, and check/uncheck them. So, I tried to add a new calendar, using the direct calendar link that the GCal website generates (http://www.google.com/calendar/ical/myfriend%40gmail.com/public/basic.ics). I also tried the way it's listed in iCal when I do "Get Info" on the delegate calendar (www.google.com/calendar/dav/myfriend%40gmail.com/events/). Neither one works... I get "Account Requires a Username and Password", and/or "Unable to Verify Account Information". I've tried adding both urls as "Add CalDAV Account>" as well as "Add Subscribed Calendar". I have successfully added a different calendar (a ToodleDo one) as a "Subscribed Calendar" that's an .ics link on a different server, so I think "normal" calendar subscriptions work... It's something to do with my friend's calendar being shared within the GCal system rather than just a public .ics file I think. Could anyone tell me how I'm supposed to do this? I would really appreciate any help. By the way, as a side question, what is happening when one adds a Gmail account, and toggles "ON" the "Calendars" toggle within the Gmail settings in the System Settings > Mail, Contacts, Calendars > Gmail screen? Is this just adding your GCal via the Gmail account? Does it to a CalDAV connection as default? Right now I have this toggled to OFF under my Gmail account on the phone, and I access the calendar separately as a CalDAV account. Just wondering what the difference is here. Thanks!!!!!