Whitehall telephone box

"He opened the telephone-box door. Harry stepped inside, wondering what on earth this was about. Mr. Weasley folded himself in beside Harry and closed the door. It was a tight fit; Harry was jammed against the telephone apparatus, which was hanging crookedly from the wall as though a vandal had tried to rip it off."

- Description

There was a telephone booth in Whitehall. A booth was accessible via dialling 62442 (the word M-A-G-I-C) allows one to make a connection, allowing them to state their business, receive a badge, and then transport down into the Ministry.

History
"Arthur Weasley, Misuse of Muggle Artefacts Office, here to escort Harry Potter, who has been asked to attend a disciplinary hearing..."

- Arthur Weasley to the woman's voice in a booth

This entrance to ministry was only used for visitors.

This booth network was used by Harry Potter and Arthur Weasley during Harry's hearing on 12 August, 1995, to clear Harry of charges after the Dementor attack on him and his muggle cousin Dudley Dursley at Little Whinging.

Harry Potter used the booth entrance again on 18 June, 1996 when flew from Hogwarts to London via Thestral to rescue his godfather Sirius Black with his friends Hermione Granger, Ron Weasley, Ginny Weasley, Neville Longbottom and Luna Lovegood, after he saw a false vision of Lord Voldemort torturing Black with Cruciatus Curse.

Notes and references
Вход в Министерство Магии с улицы Уайтхолл