You can find the Cellphone in the cold, icy cave in the Mountains of the Moon. To get Vince away from his satchel so that you can steal the moonstone, you must call 555-6789 on the cell phone so that he would wander away to find his phone. Then, his Egyptian workers will run away. You can then steal the moonstone.
The code 1337 (for the Ned Noodlehead costume) is based off of the language called "leet." In leetspeak, 1337 means leet which means elite.
The code 1225 (for the Santa hat and bag) is a reference to Christmas's date (12 meaning the month December & 25 meaning the 25th of December).
The code 911 (for the police hat and belt) comes from the phone number 911, which calls the Emergency People. Such as the paramedics, fire-fighters, and of course, the police.
411 is the telephone number for local directory assistance in the United States and Canada. In other words, you call it for information hence the glass brain hat.
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