Understanding Alphanumeric Phone Numbers...
Minnesotastan found a delightfully thorough post a... ...pular. The amount of letters at the start of the exchange -name which stood for the exchange ’s ID-number, varied from country to country, an... ...usually the first two or first three in any given exchange -name. In...
https://www.neatorama.com/2010/10/18/understanding-alphanumeric-phone-numbers/
