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How is 1-999-367-3767 the numerical form of EMP DROP? 

367 would be DMP, and 3767 would be DPMP. You do have to press the buttons the required amount of times to obtain the secondary and teritary letters - surely "EMP DROP" is just a massive guess out of a million combinations of letters found on these three numbers (3, 6 and 7)?

In case you're struggling with the idea of a phone:

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