As a Chobit, Chi is highly advanced compared to other persocoms. She has the ability to read data from other persocoms without opening a direct channel with them. When Chi accidentally wore Omura Yumi's Chiroru uniform, she became upset and ran away in tears. The bakery's manager, Hiroyasu Ueda, then asked Chi to call Yumi's phone (which is a small persocom) in order to find out where she went; however, Chi was actually able to locate Yumi without calling her persocom.
Cute cosplay! And I know a certain reader who adores this series as much as I do. Thanks to Yayoi-san for sharing this with us!