# How to check a new number before putting it in a dialer

**Before a new number goes into your dialer, check what it shows when it calls a real phone, confirm your provider has set up caller authentication and your caller name, register it with the call-analytics companies, and start with a steady volume of calls to people who expect you.** A "new" number isn't always clean. Many are recycled, and a number with no calling history can draw extra scrutiny on its own.

*The first Spam I Am check on any number is free, with no signup, and covers AT&T, Verizon and T-Mobile.*

## Why a new number can already show as spam

- **It's probably recycled.** When someone disconnects a number, FCC rules require it to sit unassigned for at least 45 days before it's given to a new customer. After that, it can be reassigned. Hiya lists a previous owner's flagged history as one reason a number can carry a spam label.
- **It may have been spoofed.** Scammers fake real numbers on caller ID. If yours was used that way, recipients may have blocked and reported it before you ever had it.
- **It has no history.** Hiya grades a number's "maturity" and says numbers with little or no calling history can be a red flag. To analytics systems, a fresh number can look like someone switching numbers to dodge labels.

## Pre-flight checklist

### 1. Check what the number shows today
Make one test call to a real phone and see what appears: any warning label, and the caller name.

- **[Run a check](/#check) on all three carriers.** You'll see the label, caller name and a screenshot from a real phone on AT&T, Verizon and T-Mobile.
- **Or do it yourself:** call a colleague or friend on each carrier and ask for a screenshot.

**If it's already flagged before you've used it,** you have two honest options. You can request a review now (see the [AT&T](/guides/remove-spam-label-att), [Verizon](/guides/remove-spam-label-verizon) and [T-Mobile](/guides/remove-scam-likely-tmobile) guides), or ask your provider for a different number before you start using it. Swapping a number that arrived already flagged is different from cycling through numbers to escape labels your own calls earned.

### 2. Confirm your setup with your phone provider
Ask your provider two questions:

- **"Will my calls from this number get full ('A') STIR/SHAKEN attestation?"** Attestation shows carriers you're authorized to use the number. Analytics engines treat it as one input, and calls with only partial or gateway attestation draw more scrutiny. It won't prevent a label on its own: Verizon, for example, says it doesn't label or block calls based on caller ID authentication alone.
- **"What caller name (CNAM) is set for this number?"** Your caller name is separate from spam labels. Ask your provider to set it to your business name.

### 3. Register the number before you start calling
All free:

- **[Free Caller Registry](https://freecallerregistry.com):** one form that sends your details to Hiya, First Orion and TNS, the analytics providers behind AT&T, T-Mobile and Verizon.
- **[Hiya Number Registration](https://www.hiya.com/products/connect/number-registration):** Hiya supplies AT&T's labels. Business numbers get verified, plus a free spam-status view and report card. Dialpad's help center notes that analytics providers trust direct registration more than Free Caller Registry submissions.
- **[First Orion Business Number Registration](https://firstorion.com/register-your-number/):** First Orion supplies T-Mobile's labels.

Give registration a few days. Hiya says changes can take a few additional days to reach carrier systems after verification.

### 4. Start steady, with calls people expect
- **Make normal calls first.** Hiya says a number becomes "mature" through higher volume or through calls spread over days or weeks, even at low volume. A handful of real calls makes a difference.
- **Avoid sudden bursts.** The FCC's examples of reasonable analytics include large bursts of calls in a short window, low average call duration, and low call-completion ratios. Ramp volume up gradually instead of switching a new number straight to full dialer speed.
- **Call people who expect you.** Hiya points to stale lead lists, minimal consent, and repeat calls after someone shows no interest as common causes of poor reputation.
- **Use the number consistently.** Dialpad recommends using the same number for the same purpose, so its reputation reflects one consistent type of call.

### 5. Re-check once calls are underway
A clean result on day one doesn't guarantee a clean result after your first week of volume. Re-check after the number has been in use for a few days, then periodically, especially after any jump in volume.

## For developers: build the check into your pipeline

If you provision numbers for AI voice or sales agents (for example on Twilio, Retell, Vapi or Bland):

- **Gate first use on a check.** Run a check when a number is provisioned, and don't release it to campaigns until it comes back clean, or until a human decides what to do.
- **Re-check on a schedule.** Check active numbers periodically, and after volume spikes.
- **Escalate, don't auto-swap.** When a number gets flagged, pause it and alert a human to start a review. Automatically rotating to a fresh number hides the problem from you and looks like label evasion to the analytics engines.
- **Watch for blocking too.** A check shows labels. Blocked calls show up in your SIP responses as 603+ "Network Blocked." [What 603+ means](/guides/sip-603-plus-608-network-blocked)

You can run these checks from your pipeline with the [API](/docs/api).

## What not to do

- **Don't buy a batch of numbers to rotate through.** Numbers with no history draw scrutiny, and rotating to stay ahead of labels is the behavior analytics systems are built to catch.
- **Don't call from a number you aren't assigned.** First Orion says calls from invalid or unassigned numbers are more likely to be flagged. We never spoof numbers, and a check has to come from the number itself.
- **Don't treat registration as a guarantee.** It establishes who you are. How people respond to your calls still drives labels.

## FAQ

### Can a brand-new phone number already be marked as spam?
Yes. Many "new" numbers are recycled after at least 45 days out of service, and a previous owner's history can follow the number. Numbers can also be spoofed by scammers, and a number with no calling history can draw extra scrutiny on its own.

### How do I check if a new number is flagged before I use it?
Call a real phone on each carrier and see what appears. Spam I Am does this on AT&T, Verizon and T-Mobile, and the first check on any number is free. You can also ask someone on each carrier to take a test call and screenshot it.

### Should I "warm up" a new number?
Start with normal calls to people who expect to hear from you, and increase volume gradually rather than in sudden bursts. That builds a genuine calling history. It isn't a trick to get past filters, and it won't offset calls people don't want.

### What should I do if my new number is already flagged?
Request a review from the analytics provider for that carrier, or ask your provider for a different number before you start using it. Don't cycle through numbers to dodge labels your own calls caused.

## Sources

- [NANPA: 45-day minimum aging reminder](https://nanpa.com/sites/default/files/2024-07/NANPA_45_Day_Min%20Aging_Reminder.pdf)
- [FCC DA 26-397 (number aging rule, 47 CFR 52.15)](https://docs.fcc.gov/public/attachments/DA-26-397A1.pdf)
- [Hiya Help: My phone number is labeled as spam](https://spamblocker-support.hiya.com/en/articles/28-my-phone-number-is-labeled-as-spam-%E2%80%94-how-to-fix-it)
- [Hiya Connect: Caller reputation and spam label help](https://connect-support.hiya.com/hc/en-us/articles/54311390207891-Caller-reputation-and-spam-label-help)
- [Hiya: Number Registration](https://hiya.com/products/registration)
- [First Orion: Business Number Registration](https://firstorion.com/?p=35844)
- [Verizon voice spam feedback](https://voicespamfeedback.com/vsf/)
- [Dialpad: How to prevent being flagged as a spam caller](https://help.dialpad.com/v1/docs/how-to-prevent-being-flagged-as-a-spam-caller)
- [ACA International: Summary of FCC 2019 declaratory ruling](https://policymakers.acainternational.org/wp-content/uploads/2020/09/concerns-regarding-fcc-call-blocking-and-labeling-efforts-declaratory-ruling-and-fnprm-may-2019.pdf)
- [TNS: How legitimate business calls become "Spam Likely"](https://tnsi.com/?p=27340)
- [Commsrisk: Are robocall analytics firms wrongly labeling legitimate calls?](https://commsrisk.com/?p=40001)
- [TNS: FreeCallerRegistry.com launch](https://tnsi.com/?p=2046)