Why Do Mobile Numbers Have Exactly 10 Digits? Why Not Less?

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The number of digits in a mobile number depends on the number of combinations those numbers can offer, without dialing the country code.

Imagine you have two cards and two envelopes—2 are blue, and two are yellow. Now, how many possible ways can you arrange them in a pair?

Blue card-Yellow card, Blue card-blue envelope, Blue envelope-yellow envelope, blue envelope-blue card; 4 ways.

This answer could also be predicted using ‘Permutations and Combinations,’ simply math combined with logic.

Simply put, the equation is this: 2 (no. of cards) x 2 (no. of envelopes) = 4.

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