After escaping the dungeon Ethan Hunt phones the IMF organisation from a phone box.
17 Great Windmill St, London W1D 7LT, United Kingdom
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The boxes are real, though there aren't quite as many of them as appear in the film.
Ethan and team take on their most impossible mission yet—eradicating 'The Syndicate', an International and highly-skilled rogue organisation committed to destroying the IMF.