MSISDN
An MSISDN is the full international number of a mobile subscriber, written in E.164 form: a plus sign, country code and national number.
In detail
E.164 caps the whole string at fifteen digits, which is why the API here accepts and returns numbers in that one shape rather than in local dialling notation. Storing anything else — leading zeros, spaces, national trunk prefixes — is the usual cause of a code being matched against the wrong activation. Normalise once, on receipt, and compare only normalised values afterwards.
Also known as
- e164
- international number format