A2P 10DLC Registration for Home Security Dealers (2026 Guide)

Home security is a compliance-heavy trade already: alarm permits, licensing, monitoring contracts, municipal false-alarm ordinances. Here is one more registration that most dealers learn about the hard way, when the summer sales team's follow-up texts stop getting replies: A2P 10DLC. If software sends your texts and the number is not registered, in 2026 those messages are being blocked or silently filtered.

This guide covers 10DLC registration specifically for alarm and home security dealers: what it is, what it costs, exactly what to submit, and the vertical's particular traps, most of which come down to one thing: the words that sell alarms at the door ("free system," "break-ins in your area," "police response") are the same words that fail carrier vetting.

What A2P 10DLC is, in plain words

A2P means application-to-person: texts sent by software (your CRM, follow-up tool, or dialer platform) instead of typed on a handset. 10DLC is the standard 10-digit local number they come from. AT&T, T-Mobile, and Verizon require every business sending A2P texts to register through The Campaign Registry (TCR): a Brand (your legal company identity) and a Campaign (your messaging program with real sample messages). Registered traffic gets delivered. Unregistered traffic gets rejected at the API or filtered by the carrier.

Why home security texting gets filtered

The alarm industry earned decades of consumer complaints through boiler-room telemarketing, "your alarm company went out of business" slam calls, and door-knock crews texting entire neighborhoods. Carrier spam filters learned from every one of those complaint reports, so security vocabulary (alarm, break-in, monitoring, free system) draws elevated scrutiny even on clean numbers. A legitimate home security sales team starts in a bad neighborhood reputation-wise; registration plus clean copy is how you get treated like a business instead of a slammer.

Dealer or national brand: who registers?

Whoever owns the sending numbers. If you are an authorized dealer texting your own leads and customers, your dealer entity registers its own brand on its own EIN. The national brand's registration does not extend to your numbers, and registering under their name when your EIN says otherwise fails vetting. Your messages should identify your dealership ("Sentinel Security, an authorized [Brand] dealer" is fine).

Step 1: Register your brand ($4 one-time)

1. Legal entity name exactly matching IRS records. "Sentinel Security Group LLC," not the yard-sign brand. Name/EIN mismatch is the most common brand failure.
2. EIN, business address, website. Your site should show the same entity name, your alarm license number where your state requires it, and a privacy policy that mentions texting.
3. Company-domain contact email, not a Gmail.

Independent reps without an EIN can file as Sole Proprietor, capped around 1,000 messages a day with the heaviest filtering. If you hold an alarm license, you have an entity; register it.

Step 2: Register your campaign (~$15 vetting + $1.50 to $12/month)

Vetting is approximately $15 one-time; monthly fees run roughly $1.50 to $2 for Low Volume Mixed up to about $10 to $12 for Mixed or Marketing. Most dealers fit Low Volume Mixed (under about 2,000 messages/day) or Mixed: your traffic is quotes and follow-ups (marketing) plus install scheduling and account notices (customer care).

Campaign description that passes

Sentinel Security Group sends quote follow-ups, installation
scheduling confirmations, technician arrival notifications, alarm
permit renewal reminders, and occasional system upgrade offers to
homeowners who requested a quote via our website or from a company
representative, and to existing monitoring customers. All messages
identify Sentinel Security Group and include opt-out instructions.

Sample messages that pass vetting

Hi [FirstName], it's Marcus with Sentinel Security. Good meeting
you today. Here's your quote for the 6-sensor system with doorbell
cam: [link]. Happy to walk through it whenever. Reply STOP to opt out.

Sentinel Security: [FirstName], your install is confirmed for [Date],
[Window]. [TechName] will text when heading over. Reply R to
reschedule. Reply STOP to opt out.

Hi [FirstName], heads up: your alarm permit with [City] renews next
month. Want us to handle the paperwork like last year? - Marcus,
Sentinel Security

What gets rejected:

ALERT: Break-ins reported in your neighborhood! Protect your family
with a FREE security system + FREE installation. Police respond in
minutes! Claim now: bit.ly/xyz

That sample fails on five counts: fear-based urgency, "FREE" twice, an implied guaranteed police response, "claim now" pressure, and a public link shortener.

Home-security-specific gotchas

• "Free system / free installation" claims. The classic alarm-industry pitch is a deceptive-marketing flag to vetters, because the "free" system rides on a 36-month monitoring contract. Say "$0 upfront with monitoring plan" and disclose the contract.
• Monitoring and response claims. Anything guaranteeing police dispatch, response times, or "24/7 protection that never fails" is unverifiable-claim territory. Dispatch is the police department's call, not yours. "Professionally monitored 24/7" is accurate and passes.
• Fear-based copy. "Break-ins are up in your area" blasts are among the most-reported message patterns in home services. High report rates will get a registered campaign suspended after approval, not just rejected before it.
• The industry's telemarketing baggage. Alarm slamming enforcement history means impersonation of another company ("we're taking over your monitoring") in any message is a serious legal problem, far beyond vetting.
• Permit-adjacent texts. Alarm-permit renewal reminders to your own customers are great customer-care content. Cold texts to strangers about "expiring permits" you know nothing about read as a scam pattern and require the express written consent you do not have, as covered in our TCPA compliance guide.

What your trust score buys: throughput by tier

TCR scores your brand 0 to 100; the score sets your sending capacity. T-Mobile enforces published daily caps toward its subscribers, AT&T rate-limits per minute by campaign class, and Verizon filters on reputation.

A 10-rep summer sales team doing honest follow-up rarely breaks 1,000 texts a day, so even the low tier covers you. If your score comes back lower than expected, external vetting (roughly $40 one-time) can re-score the brand.

Opt-in and opt-out: what to put in the messages

• Opt-in: capture consent with the number. Quote form checkbox: "I agree to receive texts from Sentinel Security about my quote and installation. Msg & data rates may apply. Reply STOP to opt out." At the door, the rep confirms texting and logs it with a timestamp.
• Opt-out: STOP, CANCEL, QUIT suppress the number immediately and permanently, across sales follow-up and account notices alike.

Footer for the first message of a thread and any blast:

Sentinel Security Group. Msg & data rates may apply. Msg frequency
varies. Reply HELP for help, STOP to opt out.

Consent requirements, quiet hours (federal 8am to 9pm recipient local time, stricter in some states), and per-state wrinkles live on the TCPA side, separate from 10DLC; the state SMS rules hub has the map.

What happens if you skip it

On Twilio-backed platforms, unregistered US-bound traffic dies at the API with error 30034 ("message from an unregistered number"). On other routes, carriers filter silently: your CRM says delivered-ish, the homeowner's phone shows nothing, and your summer team concludes texting "doesn't work in this market." Every filtered message also erodes the number's reputation, making the eventual recovery slower. Our Twilio deliverability guide covers the full diagnosis.

If your dealership cross-sells adjacent services, the process is identical everywhere: see the companion guides for solar companies and pest control operators. Same registry, different sample messages.

Or skip the paperwork entirely

FollowUp handles all of this for security dealers. The Autopilot tier includes a dedicated 10DLC-registered business number, brand and campaign vetting already done, so quote follow-ups, install confirmations, and renewal reminders ride carrier-trusted infrastructure from day one, with opt-outs and quiet hours enforced automatically.

Frequently asked questions

Do home security companies need A2P 10DLC registration to text leads?

Yes. Any alarm or home security dealer sending business SMS to US numbers through software from a 10-digit local number must register a brand and campaign with The Campaign Registry (TCR). In 2026, Twilio rejects unregistered US-bound traffic with error 30034, and AT&T, T-Mobile, and Verizon filter unregistered traffic on other routes.

How much does 10DLC registration cost for an alarm dealer?

Brand registration is a $4 one-time fee. Campaign registration adds approximately $15 in one-time vetting plus roughly $1.50 to $12 per month depending on use case. A typical dealer fits Low Volume Mixed (about $1.50 to $2/month) or Mixed (about $10/month). Carriers add small per-segment surcharges.

Why do home security SMS campaigns get rejected?

The usual triggers: "free system" or "free installation" claims in samples, fear-based urgency copy, guaranteed police-response or dispatch-time claims, campaign descriptions that read like door-knocking lead generation, and missing opt-in or opt-out language. Rewrite samples around quotes, install scheduling, and account follow-up, then resubmit.

Does the dealer or the monitoring company register for 10DLC?

Whoever owns the number and sends the texts. If you are an authorized dealer texting your own leads and customers from your own numbers, your dealer entity registers its own brand and campaign. The national brand's registration does not cover your traffic. Register the entity on your EIN and identify your dealership in messages.

Can I text homeowners about their alarm permit or system upgrade?

Existing customers, yes: permit-renewal reminders, service notices, and upgrade offers to your own customer base are exactly what a Mixed campaign covers, provided they opted in and have not replied STOP. Cold-texting strangers about "expiring permits" or "neighborhood break-ins" is both a vetting rejection and a TCPA problem, since automated marketing texts require prior express written consent.