you should be able to add someone by using their pin number by going to messenger>add contact>use once, press the menu key> request by pin...and then type their pin in...
Yea I Tried My Pin And Nothing I Tried By Email And Nothing.they Aslo Tried To Add Me And I Didn't Get A Message Either. Also I Have A Data Plan And As Well They Do Too. So I Have No Clue Why Its Not Working