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* The unique identifier for the session in which this attempt took place.
* The ordinal identifier for this attempt within a session.
* The name of the `VerificationCodeSender` used in this attempt.
* A sender-specific identifier for this attempt; may be empty if the sender does not produce identifiers for each attempt. Sender-specific identifiers are not guaranteed to be unique.
* The message transport via which this attempt took place.
* The type of client that initiated this attempt.
* The ISO 3166-1 identifier for the region of the phone number associated with this attempt.
* The timestamp, in milliseconds since the epoch, at which this attempt took place.
* Indicates whether an account already exists with the given e164 (i.e. this is a "re-registration" attempt).
* Indicates whether this attempt to verify a phone number ultimately succeeded.
* The MCC as reported by a number lookup service.
* The MNC as reported by a number lookup service.