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Machine-2-machine (M2M) communication might play a role in the big number of addresses, not sure though.

You are correct, the 020 prefix is exclusively reserved for M2M. The "conventional" 070, 080 and 090 prefixes are used for smartphones & M2M and the Japanese government has tried to move the vast majority of M2M to 020. It was already expected that the current 11 digit number for 020 is not sufficient, and AFAIK there is a plan for numbers up to 14 digits.

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