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_LAST_SEEN

When the phone was last observed.

Value	Name	Description
`LAST_DAY`	Phone number last seen within the last day	The phone number was last seen within the last day, which means it’s been recently active and likely not a risk factor by itself.
`LAST_WEEK`	Phone number last seen within the last week	The phone number was last seen within the last week, which means it’s been recently active and likely not a risk factor by itself.
`LAST_MONTH`	Phone number last seen within the last month	The phone number was last seen within the last month, which means it’s been recently active and likely not a risk factor by itself.
`LAST_YEAR_1`	Phone number last seen within the last year	The phone number was last seen within the last year; has been active but more than a month ago.
`LAST_YEAR_2`	Phone number last seen within the last two years	The phone number was last seen within the last two years; seen before but not recently, which could indicate potential fraud.
`LAST_YEAR_3`	Phone number last seen within the last three years	The phone number has not been seen in a long time, which could indicate potential fraud.
`LAST_YEAR_4`	Phone number last seen within the last four years	The phone number has not been seen in a long time, which could indicate potential fraud.
`BEYOND_YEAR_5`	Phone number last seen more than five years ago	The phone number has not been seen in several years, which could indicate potential fraud.
`NONE`	No phone number data available	No phone number provided, or unable to determine last seen date.

PHONE_FIRST_SEEN

When the phone was first observed.

Value	Name	Description
`LAST_DAY`	Phone number was first seen in the last day	This phone number was first seen in the last day, implying a new account or recently ported number—common factors with synthetic identities and fraud.
`LAST_WEEK`	Phone number first seen within the last week	The phone number was first seen within the last week; likely new or recently ported—common synthetic identity factor.
`LAST_MONTH`	Phone number first seen within the last month	The phone number was first seen within the last month; likely new or recently ported—common synthetic identity factor.
`LAST_YEAR_1`	Phone number first seen within the last year	The phone number was first seen within the last year; recent but not inherently risky.
`LAST_YEAR_2`	Phone number first seen within the last two years	The phone number was first seen within the last two years; likely legitimate.
`LAST_YEAR_3`	Phone number first seen within the last four years	The phone number was first seen within the last four years; likely legitimate.
`LAST_YEAR_4`	Phone number first seen within the last four years	The phone number was first seen within the last four years; likely legitimate.
`BEYOND_YEAR_5`	Phone number first seen more than four years ago	The phone number was first seen more than four years ago; likely legitimate.
`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
`BUSINESS`	Business phone number	A low-risk phone number, often tied to a business or organization.

PHONE_DNO_VOICE_RISK

VOIP carrier or data only SMS numbers

Value	Name	Description
`TRUE`	Phone only receives voice lines	The phone cannot originate voice calls.
`FALSE`

PHONE_PORT_RISK

Flags numbers that have been recently ported between carriers

Value	Name	Description
`NEW`	Less than 3 days ago	Less than 3 days ago.
`RECENT`	Less than a month ago	Less than a month ago.
`MODERATE`	Less than a year ago	Less than a year ago
`OLDER`	1 year or more	1 year or more
`NEVER`	Never	Phones never been ported
`UNKNOWN`	Unknown	It's unknown if this phone has been ported or not