Can anyone let me know if i need to do full AD synch after adding a new mapping in manage user properties. I created a mapping between the mobile user profile property and AD however the mobile numbers don't appear in anybody's mysite. Any ideas?
Yes, you'll want to do a full import after creating the custom property and mapping. I had to do that to get our custom Mail Stop user profile field to show up in My Site profiles after creating it and setting the mapping.