A2P Messaging & SMS Compliance
What every business owner needs to know about texting customers legally in 2025 and beyond.
If you text customers from any software platform, you are sending A2P messages. The FCC, carriers, and state governments all regulate this. This page explains what A2P is, why it matters, and what happens if you ignore it. The Registration & Account Setup and Campaign Rules & Sending Limits pages cover the how.
1. What Is A2P Messaging?
Every time your business sends a text through a CRM, marketing platform, or automation tool, that's an A2P (Application-to-Person) message. It doesn't matter if it feels like a personal text — if it comes from software, the carriers and the FCC treat it as business messaging.
A2P Messaging
Application-to-Person. Any text message sent from a software platform (not a personal phone) to a customer. If you use a CRM, marketing tool, or automation platform to send texts — that's A2P.
P2P Messaging
Person-to-Person. A regular text between two people on their phones. This is NOT what businesses do when they text from a platform.
10DLC
10-Digit Long Code. A standard local phone number (like 555-867-5309) that's been registered and approved for business texting. This replaced the old method of just texting from any number.
Short Code
A 5-6 digit number (like 12345) used by large companies for mass messaging. Expensive, slow to get, and not what most small businesses need.
Toll-Free
An 800-series number verified for business texting. Another option, but 10DLC is the standard for local businesses.
Bottom line: if you're texting customers from anything other than your personal phone with your personal number, you're sending A2P messages and you need to be registered and compliant.
2. How We Got Here — A Brief History
Businesses could text from almost any number with no registration. Spam was rampant. Carriers had no way to distinguish legitimate businesses from scammers.
The major carriers (AT&T, T-Mobile, Verizon) created a shared registration system. Every business sending A2P texts would need to register their brand and campaigns.
T-Mobile led the charge requiring all A2P traffic on 10DLC numbers to be registered. Unregistered traffic started getting blocked or filtered. AT&T and Verizon followed.
The FCC's new rule requires "one-to-one" consent. A consumer opting in on one website can no longer be contacted by dozens of companies. Consent must be specific to YOUR business.
Carriers actively block unregistered traffic. The FCC is issuing record fines. If you're not registered and compliant, your messages simply won't deliver.
3. FCC & TCPA Rules (Non-Negotiable)
The Telephone Consumer Protection Act (TCPA) is the federal law that governs business texting. The FCC enforces it. These are not guidelines — they are legal requirements.
Prior Express Written Consentcritical
Before you send a single marketing text, the person must have explicitly opted in. This means they filled out a form, checked a box, or texted a keyword — and it was clear they were agreeing to receive texts from YOUR business specifically.
One-to-One Consent (2024 FCC Ruling)critical
The FCC closed the "lead generator loophole." If someone fills out a form on a third-party website, that consent only applies to the specific business they agreed to hear from — not a list of partners. You cannot buy a lead list and start texting people.
Clear Opt-Out in Every Message
Every marketing text must include a way to stop receiving messages. "Reply STOP to opt out" is the standard. When someone replies STOP, you must honor it immediately — no exceptions, no delays.
Business Identification
Recipients must know who is texting them. Your business name should be clear in the message. Anonymous or misleading texts violate FCC rules.
Time-of-Day Restrictions
Marketing texts cannot be sent before 8:00 AM or after 9:00 PM in the recipient's local time zone. Some states have stricter windows.
Record Keeping
You must keep records of consent — when it was given, how it was given, and what the person agreed to. If challenged, the burden of proof is on YOU to show valid consent.
4. What Happens If You Don't Comply
$500 - $1,500 per unsolicited text
The TCPA allows recipients to sue for $500 per unwanted text, and up to $1,500 per text if the violation was willful. Class action lawsuits with thousands of plaintiffs are common.
FCC fines in the millions
The FCC has issued fines exceeding $100 million to repeat offenders. Even smaller businesses face five- and six-figure penalties.
Carrier blocking
AT&T, T-Mobile, and Verizon will simply stop delivering your messages. No warning, no appeal. Your texts go into a black hole and your customers never see them.
Number blacklisting
Your phone numbers get flagged across the entire carrier ecosystem. Even if you switch providers, the numbers are burned.
Platform suspension
Twilio and other messaging providers will suspend your account if you violate their acceptable use policies. You lose your numbers and messaging capability entirely.
This isn't theoretical. TCPA lawsuits are one of the most active areas of litigation in the United States. Plaintiff attorneys actively look for businesses texting without proper consent.
5. What We Do To Keep You Compliant
We handle the complexity so you don't have to. Our platform runs on Twilio's messaging infrastructure, which is the same carrier network used by Uber, Airbnb, and thousands of other businesses. Here's what we manage for every account:
- ✓A2P Brand Registration — We register your business with The Campaign Registry (TCR) so carriers recognize you as a legitimate sender.
- ✓Campaign Registration — Every type of text you send (appointment reminders, marketing, follow-ups) is registered as a separate campaign with approved messaging.
- ✓Automatic Opt-Out Handling — STOP, UNSUBSCRIBE, CANCEL, and other opt-out keywords are honored automatically and immediately. No manual work required.
- ✓Opt-Out Rate Monitoring & Auto-Pause — If a campaign's opt-out rate exceeds carrier thresholds, the platform automatically pauses the campaign to protect your number.
- ✓Daily Sending Limits & Ramp-Up — New numbers start with low daily limits and gradually increase over weeks. This builds carrier trust and prevents your messages from being flagged as spam.
- ✓Consent Documentation — Every opt-in is logged with a timestamp, source, and the exact language the person agreed to.
For the full details on registration requirements, see A2P Registration & Account Setup. For sending limits and campaign rules, see SMS Campaign Rules & Sending Limits.
Source Links & References
- •FCC — Telephone Consumer Protection Act (TCPA) Overview — fcc.gov/general/telemarketing-and-robocalls
- •FCC 2024 Declaratory Ruling — Closing the Lead Generator Loophole — fcc.gov/document/fcc-closes-lead-generator-loophole
- •The Campaign Registry (TCR) — campaignregistry.com
- •Twilio A2P 10DLC Documentation — twilio.com/docs/messaging/guides/10dlc
- •CTIA Messaging Principles and Best Practices — ctia.org/the-wireless-industry/industry-commitments/messaging-principles-and-best-practices