For collection agencies and AR teams
Run each placement file through the lookup before the first call: numbers a carrier deactivated recently, mobile or landline after porting, which numbers can take a text, known TCPA litigators, and the time zone where each number was issued. It checks the number, not the person: no names, no right-party verification, no skip tracing.
| If the lookup says | Do this |
|---|---|
| Deactivated in the last 45 days | Don't dial |
| Mobile, no prior express consent | No autodialer |
| Landline | Dial |
| Can take a text | Text with opt-out |
| Known TCPA litigator | Compliance review |
| Before 8 a.m. or after 9 p.m. local | Hold |
Built from fields in the lookup response. The litigator check costs 1 extra credit.
A number reassigned since the consumer gave it now reaches someone who never consented, and the reassigned-number safe harbor only covers the FCC's database. deactivationDate flags carrier deactivations from the last 45 days.
47 CFR 64.1200(m) · ecfr.gov
deactivationDatereason Autodialed or prerecorded calls to a cell phone need the called party's prior express consent. The live carrier dip says mobile or landline after porting.
47 CFR 64.1200(a)(1)(iii) · ecfr.gov
nanpTypedipCarrierTypedipPorted Under Regulation F, every collection text needs a clear, simple way to opt out of further texts to that number. smsEligible marks numbers that can take a text; the landline SMS check covers landlines.
12 CFR 1006.6(e) · ecfr.gov
smsEligibledipMessagingEnabled Under Regulation F, unless you know otherwise, a call before 8 a.m. or after 9 p.m., local time at the consumer's location, is inconvenient.
12 CFR 1006.6(b)(1)(i) · ecfr.gov
timezonetzOffset About 1.5% of the numbers we check come back flagged as TCPA litigators when the scrub is on.
Source: CheckThatPhone lookup data
litigatorlitigator_type What a collections team does with each result. These rules check the number, never who answers it.
| If the response shows | Field | Do this |
|---|---|---|
| Deactivated by the carrier recently | deactivationDatereason | Don't dial. Route the account to your own skip-trace process. |
| Mobile | nanpType = mobiledipCarrierType | Cell-phone consent path: no autodialed or prerecorded calls without the consumer's prior express consent. |
| Landline | nanpType = landlinedipCarrierType | Dial. Ignore action: "unsubscribe", which only means it can't take a text. |
| Can take a text | smsEligibledipMessagingEnabled | Eligible for your text workflow. Every message needs a clear, simple opt-out. |
| Local time | timezonetzOffsetgeoSource | Call between 8 a.m. and 9 p.m. at the consumer's location. Prefer the location on the account; the area code's zone is only where the number was issued. |
| Known TCPA litigator | litigatorlitigator_type | Send to compliance review before any call or text. |
| Carrier differs from your records | dipCarrierdipOcndipPorted | Update the account record. dipPorted has no date, so it says the number moved, not when. |
Upload the placement file as a CSV: deduplicated, up to 1,000,000 rows, each unique number billed once.
Re-check the numbers you are about to dial or text, or call the API from your dialer list-loading job. Deactivation data refreshes daily.
Catch new deactivations and carrier changes across open accounts. Deactivation entries expire after 45 days, so re-scrub at least monthly.
A mobile that ported to a new carrier: the cell-phone consent path applies, the carrier on the account record needs updating, it can take a text, it is not a known litigator, and the area code puts it on Central time.
Highlighted fields: nanpType, dipPorted, dipCarrier, litigator, timezone, smsEligible.
{
"success": true,
"credits_used": 2,
"data": {
"subscriber": "3125550144",
"optDate": "2026-10-09T14:20:07.392Z",
"action": "send",
"deliverable": "true",
"nanpType": "mobile",
"blackList": "false",
"dip": "success",
"dipLrn": "3125550101",
"dipPorted": "true",
"dipOcn": "6529",
"dipCarrierSubType": "PCS",
"dipCarrier": "T-Mobile",
"dipCarrierType": "mobile",
"litigator": "false",
"litigator_type": "",
"litigator_name": "",
"geoState": "IL",
"geoCity": "chicago",
"geoCountry": "US",
"timezone": "America/Chicago",
"tzOffset": 6,
"geoSource": "area-code",
"error": "false",
"smsEligible": "true"
}
}State DNC and complainer checks never add credits. The landline SMS check adds 1 credit per landline; mobiles are not charged.
Not legal advice.
dncStateChecked is left out for them, so "not checked" never reads as clear.deactivationDate: data refreshed daily, with a 1 to 7 day lag, and entries expire after 45 days. It is not a reassigned-number check.No. The lookup checks numbers; Regulation F governs how you communicate. Call frequency, for example, is counted per debt in your own system: more than seven calls in seven consecutive days is presumed to violate the rule (12 CFR 1006.14(b)(2)). The CFPB's debt collection rule FAQs cover the rest. This is not legal advice.
No. We return no subscriber names, we don't confirm that a number belongs to the consumer (no right-party verification), and we don't do skip tracing. A deactivated number is a signal to route the account to your own skip-trace process.
No. deactivationDate shows a carrier deactivation in the last 45 days, but a reactivated number shows no date whether it went back to the same subscriber or a new one. The reassigned-number safe harbor in 47 CFR 64.1200(m) only covers the FCC's Reassigned Numbers Database.
Regulation F's calling hours use local time at the consumer's location (12 CFR 1006.6(b)(1)(i)). timezone comes from an IP you pass, or else from the area code, which is where the number was issued, not necessarily where the consumer lives. Prefer the location on the account. When your information conflicts, the CFPB's FAQs say a time that is convenient in every possible location complies.
smsEligible is "true" for active mobiles and, with the landline SMS check (+1 credit per landline), for landlines that can take a text; about 7% of the landlines we check can. Every collection text needs a clear, simple opt-out (12 CFR 1006.6(e)).
Regulation F applies to debt collectors as the Fair Debt Collection Practices Act defines them, so ask counsel whether that includes your team. The TCPA's consent rule for autodialed or prerecorded calls to cell phones applies to every caller (47 CFR 64.1200(a)(1)(iii)).
CSV upload up to 1,000,000 rows, deduplicated, each unique number billed once.