IsE164Format returns whether a string is a E.164 formatted phone number.

IsMccIsoCode determines whether a MCC is associated with the provided ISO country code.

IsVerificationCode returns whether a string is a 4-10 digit numberical verification code.

ErrInvalidNumber is returned if the phone number is invalid.

ErrInvalidVerificationCode is returned when the verification does not match what's expected in a Confirm call.

ErrNoVerification indicates that no verification is in progress for the provided phone number in a Confirm call.

ErrRateLimited indicates that the call was rate limited.

ErrUnsupportedPhoneType indicates the provided phone number maps to a type of phone that isn't supported.

Metadata provides additional information regarding a phone number.

Identifies type of phone.