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# of phone numbers Population Connections/100 citizens Date of evaluation World: 7,950,000,000+ ...
Country calling codes or country dial-in codes are telephone number prefixes for reaching telephone subscribers in the networks of the member countries or regions of the International Telecommunication Union (ITU). The codes are defined by the ITU-T in standards E.123 and E.164.
In mainland China, mobile phone numbers have 11 digits in the format 1xx-xxxx-xxxx (except for 140–144, which are 13-digit IoT numbers), in which the first three digits (13x to 19x) designate the mobile phone service provider. Before GSM, mobile phones had 6-digit (later upgraded to 7-digit) numbers starting with 9, and had the same numbering ...