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Q: What is E.164 phone numbering format?

E.164 number uniquely identifies a public network termination point and typically consists of three fields, CC (country code), NDC (national destination code), and SN (subscriber number), up to 15 digits in total.

For example a phone number in USA, California will look like this +14155544000, a number in UK, London will look like +442079834000 and a number in Berlin, Germany can look like this +493090260 etc.

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