Japan plans to create 10 billion 14-digit phone numbers
With the commercialization of the fifth-generation, or 5G, of superfast mobile communication format approaching, 11-digit numbers are expected to run out as early as fiscal 2022.
What's wrong with case insensitive letters? US-ABC-900-900 can be a beautiful phone number and global. 165,216,101,262,848 phone numbers per country.