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Phone

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.

ValueNameDescription
LAST_DAYPhone number last seen within the last dayThe 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_WEEKPhone number last seen within the last weekThe 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_MONTHPhone number last seen within the last monthThe 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_1Phone number last seen within the last yearThe phone number was last seen within the last year; has been active but more than a month ago.
LAST_YEAR_2Phone number last seen within the last two yearsThe phone number was last seen within the last two years; seen before but not recently, which could indicate potential fraud.
LAST_YEAR_3Phone number last seen within the last three yearsThe phone number has not been seen in a long time, which could indicate potential fraud.
LAST_YEAR_4Phone number last seen within the last four yearsThe phone number has not been seen in a long time, which could indicate potential fraud.
BEYOND_YEAR_5Phone number last seen more than five years agoThe phone number has not been seen in several years, which could indicate potential fraud.
NONENo phone number data availableNo phone number provided, or unable to determine last seen date.


PHONE_FIRST_SEEN

When the phone was first observed.

ValueNameDescription
LAST_DAYPhone number was first seen in the last dayThis 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_WEEKPhone number first seen within the last weekThe phone number was first seen within the last week; likely new or recently ported—common synthetic identity factor.
LAST_MONTHPhone number first seen within the last monthThe phone number was first seen within the last month; likely new or recently ported—common synthetic identity factor.
LAST_YEAR_1Phone number first seen within the last yearThe phone number was first seen within the last year; recent but not inherently risky.
LAST_YEAR_2Phone number first seen within the last two yearsThe phone number was first seen within the last two years; likely legitimate.
LAST_YEAR_3Phone number first seen within the last four yearsThe phone number was first seen within the last four years; likely legitimate.
LAST_YEAR_4Phone number first seen within the last four yearsThe phone number was first seen within the last four years; likely legitimate.
BEYOND_YEAR_5Phone number first seen more than four years agoThe phone number was first seen more than four years ago; likely legitimate.
NONENo phone number data availableNo phone number provided, or unable to determine first seen date.


PHONE_FORMAT_INVALID

Validity of phone format.

ValueNameDescription
TRUEInvalid phone number formatThe phone number format is invalid, which could indicate a potential fraud attempt.
FALSEValid phone number formatThe phone number format is valid and appears to be legitimate.
NONENo phone number providedNo phone number provided.


PHONE_TYPE

Type of phone number.

ValueNameDescription
BUSINESSBusiness phone numberA low-risk phone number, often tied to a business or organization.


PHONE_DNO_VOICE_RISK

VOIP carrier or data only SMS numbers

ValueNameDescription
TRUEPhone only receives voice linesThe phone cannot originate voice calls.
FALSE


PHONE_PORT_RISK

Flags numbers that have been recently ported between carriers

ValueNameDescription
NEWLess than 3 days agoLess than 3 days ago.
RECENTLess than a month agoLess than a month ago.
MODERATELess than a year agoLess than a year ago
OLDER1 year or more1 year or more
NEVERNeverPhones never been ported
UNKNOWNUnknownIt's unknown if this phone has been ported or not

What’s Next

Learn how we help you understand the validity of the incoming fields in the context of Synthetic Identity