What is 10DLC, and does a text-back need it?
10DLC is the channel carriers use for business texts sent from an ordinary ten-digit number. The Campaign Registry, which runs it, describes it as a channel where brands and their texting providers are verified before they are allowed to send2. The "brand" is your business. The "campaign" is the kind of messages you send, such as replies to missed calls, and once a campaign has its ID, messages can start2.
You do not sign up with the registry yourself. It says direct registration is not available for brands, and that a business must work with a registered messaging provider, which handles registration on its behalf2. In practice that means your phone or answering provider registers the business and the text-back campaign. Ask who your provider has listed as the brand, what the campaign is called, and whether it is approved before you switch texting on.
Do you need the caller's permission to text them back?
Assume you do. Under federal law a text message counts as a call1, so the consent rules for calls reach texts too. The wireless industry's own guide sorts texts into three kinds3. A conversational text is one where the customer texts first and the business only replies; no extra permission is expected. An informational text, such as an appointment reminder, needs the customer to agree to texts for that purpose. Promotional texts need written consent3.
A missed-call text-back does not fit the first kind. The caller phoned you; they did not text you, and the guide's conversational category is for exchanges where only the customer sends the first message3. The guide says permission for informational texts can be given verbally3, so the simplest fix is to ask on the call. A greeting or voicemail line such as "If we miss you, we'll text this number back. Reply STOP to opt out" sets that up, and an AI receptionist can ask the question directly.
Keep the text-back informational. A coupon or a sales pitch added to it may push the message into the promotional category3, which needs written consent.
What do STOP and the FCC's opt-out rules require?
Today, a customer can opt out by any reasonable method. Replying stop, quit, end, revoke, opt out, cancel or unsubscribe always counts, and other words count if a reasonable person would read them as an opt-out6. The request must be honored within ten business days, and one confirmation text is allowed, presumed fine if sent within five minutes6. These rules came from the FCC's 2024 order4, and they took effect on 11 April 20255.
That changes on 25 November 2026. An order the FCC adopted on 30 September 2026 lets a sender name an exclusive opt-out method, such as a reply with one of those words, as long as every text says how to use it7. A sender that names no exclusive method must still accept any reasonable request7. Opt-outs from informational texts may be treated as covering only that category, while an opt-out from marketing covers all future marketing7. The ten-business-day limit stays7.
The new order also ends a long delay. A 2024 provision would have made one opt-out cover every unrelated message from the sender; the FCC pushed it to April 20265, and later to 31 January 2027, and the 2026 order replaces it instead7.
| Date | What happened | Effect on a business that texts customers |
|---|---|---|
| 15 February 2024 | FCC adopts order 24-24 on revoking consent | Opt-outs by any reasonable method; honor within ten business days; one confirmation text |
| 7 April 2025 | FCC delays the rule that one opt-out covers unrelated messages | That part moves to 11 April 2026 |
| 11 April 2025 | The rest of order 24-24 takes effect | STOP and similar replies must be honored |
| 30 September 2026 | FCC adopts order 26-67, after the delayed part had been pushed to 31 January 2027 | Replaces the delayed part before it ever applied |
| 25 November 2026 | Order 26-67 takes effect | A sender may name one opt-out method; informational opt-outs can cover one category |
Why do text-backs fail without an error?
Carriers filter business texts. The industry guide says they may use campaign pre-approval, vetting, audits and unwanted-message filtering3, and all of that happens on their side, out of your view. Check three things first: that the number is registered, that the campaign was registered for text-backs and not some other use, and that the wording reads like a reply, not a promotion.
Test it like a customer would. Call your business from two phones on different carriers, let the calls go unanswered, and check that each phone gets the text and that the text names your business and says how to opt out. Then reply STOP from one phone and confirm it stops getting texts. Repeat after any change to the wording or your provider.
The FCC rules above apply on the dates shown, and this page is general information, not legal advice. If you send anything beyond replies and reminders, ask a lawyer licensed where you operate.