What A2P 10DLC registration is, why it exists, and how to pass it without delays.
A2P 10DLC (10-digit long code) registration is required for any business using text messaging to communicate with customers in the U.S. It ensures your messages are delivered reliably and comply with carrier rules.
Why does A2P exist?
Carriers like AT&T, Verizon, and T-Mobile introduced A2P regulations to:
- Combat spam and scam text messages.
- Ensure only legitimate businesses can send SMS at scale.
- Protect consumers and maintain trust in the messaging ecosystem.
Carriers have grown increasingly strict over the past few years, with heightened scrutiny in 2025. Meeting these standards is essential to avoid rejection or message filtering.
The A2P registration process
Registration includes two major steps:
Carriers verify your business details (legal name, EIN, etc.) against IRS records to confirm legitimacy.
Your SMS use case is reviewed manually for compliance. Carriers now examine your website and digital presence more strictly than before.
New carrier requirements in 2025
Follow these best practices to avoid delays or rejections:
- Clearly display your business name and contact info.
- Ensure those details match your registration info (email, phone, address).
- Include details about your business.
Your privacy policy must include a "Data Security" disclaimer explicitly stating that personally identifiable information will not be shared with third parties or affiliates for re-marketing purposes. The absence of this disclaimer is one of the most common reasons for rejection.
- Business (Brand) Name
- Product description
- Message frequency disclosure
- "Message and data rates may apply"
- Customer care contact information (email or toll-free number)
- Opt-out instructions (Reply STOP to opt-out)
Missing either page may get your application flagged or rejected, delaying registration and preventing you from texting via TheraSaaS.
- A manual checkbox users must tick (not pre-checked).
- Clear disclaimer text linking to your Privacy Policy and Terms.
- Compliant checkbox language (see below).
Compliant opt-in verbiage samples
Use the exact language below to stay in compliance. Do not edit these statements. Replace only the placeholder business name.
Most TheraSaaS users won't use SMS for marketing — but cell phone companies don't see it that way. Even if you only plan to use SMS for communication, both consent statements protect you in case you ever use it for marketing (e.g., promoting a group class or free training).
The checkbox represents a manual action by the visitor, confirming they explicitly consent to receive messages. This is essential to comply with carrier regulations and consumer protection laws.
Why this matters
Staying compliant with A2P regulations is more than a checkbox — it's essential to:
- Prevent delivery issues or blocks.
- Protect your brand reputation.
- Ensure legal compliance with TCPA and carrier rules.
- Get your SMS campaigns up and running faster.
It may take 3 to 5 weeks for a newly IRS-registered EIN to be recognized in the carriers' records.
Align your business name, domain, and email; publish a Privacy Policy (with the data-security disclaimer) and Terms; and add unchecked consent checkboxes to every form before you submit.
Missing data-security disclaimer, mismatched brand details, no Privacy Policy or Terms link on the homepage, and pre-checked or absent consent boxes.
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