What it entails

Phone checks track number origination (first_seen), usage recency (last_seen), format validity, and type (business vs. personal). They reveal newly ported or long-dormant numbers and enforce compliance with global numbering plans.

Why it works

Fraud rings exploit freshly ported or seldom-used numbers to register fake accounts. Spoofed or invalid formats and burner lines hinder traceability and facilitate fraud.

Checks

The following are the distinct IDs and types of checks that are included in the Phone Check Package.

PHONE_FIRST_SEEN

When the phone was first observed.

Value	Name	Description
`NEW`	Phone number recently first seen	The phone number was first observed within the last month.
`RECENT`	Phone number first seen within the last year	The phone number was first observed within the last year.
`OLDER`	Phone number first seen over a year ago	The phone number was first observed more than a year ago.
`LONG_AGO`	Phone number first seen long ago	The phone number was first seen more than five years ago.
`NONE`	No phone number data available	No phone number provided or unable to determine first seen date.

PHONE_FORMAT_INVALID

Validity of phone format.

Value	Name	Description
`TRUE`	Invalid phone number format	The phone number format is invalid, which could indicate a potential fraud attempt.
`FALSE`	Valid phone number format	The phone number format is valid and appears to be legitimate.
`NONE`	No phone number provided	No phone number provided.

PHONE_TYPE

Type of phone number.

Value	Name	Description
`LANDLINE`	Landline phone number	A traditional fixed phone line often tied to a physical location (e.g., home or office).
`MOBILE`	Mobile phone number	A phone number tied to a personal mobile device, typically used for voice calls, SMS, and data.
`UNKNOWN`	Phone type not known	Phone type not known
`NONE`	Phone type unavailable	Phone type unavailable

PHONE_DNO_TEXT

Do not text status.

Value	Name	Description
`TRUE`	Do not text enabled	The phone number cannot send text messages
`FALSE`	Do not text disabled	The phone number can send text messages
`UNKNOWN`	Do not text not available	Do not text information not available
`NONE`	Do not text not available, no phone number provided	Do not text information not available

PHONE_DNO_VOICE

Do not call status.

Value	Name	Description
`TRUE`	Do not call enabled	The phone number cannot make voice calls
`FALSE`	Do not call disabled	The phone number can make voice calls
`UNKNOWN`	Do not call not available	Do not call information not available
`NONE`	Do not call not available, no phone number provided	Do not text information not available

PHONE_PORT

Flags numbers that have been recently ported between carriers

Value	Name	Description
`NEW`	Phone number newly ported	The phone number has been ported in the last 3 days
`RECENT`	Phone number recently ported	The phone number has been ported in the last 30 days
`MODERATE`	Phone number ported	The phone number has been ported in the last 90 days
`UNKNOWN`	Phone number porting information unavailable	Phone number porting information not available