Call the Ministry of Magic from the red telephone booth outside King's Cross. It may seem like an unassuming prop, but if you dial M-A-G-I-C (62442), it'll direct you someone from the Ministry of Magic.
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What is the five-digit code you must dial to get in? Answer: 6-2-4-4-2. (Bonus: This spells M-A-G-I-C on a phone's keypad.) The visitor's entrance to the Ministry of Magic is an abandoned red telephone booth in London.