A text message answering service replies to the texts customers send your business number and follows up phone calls by text, so every conversation gets an answer whether it starts with a call or a message. Done well, it pairs a phone answering service with two-way texting on the same number, registered with the carriers and following the consent and opt-out rules.
Key takeaways
- Customers text business numbers expecting a reply in the same thread. A text answering service makes sure one comes, at any hour.
- Replying to a customer who texted first is conversational messaging. Under CTIA's industry guidelines, no extra permission is expected for a relevant reply.
- Business texting from a regular local number in the US runs over 10DLC, which means registering a brand and a campaign through your messaging provider with The Campaign Registry.
- Honor STOP and similar words every time. FCC rules list stop, quit, end, revoke, opt out, cancel and unsubscribe, with a 10 business day outer limit to honor them.
- callflo.ai sends a follow-up text to callers after calls, and Starter includes two-way text messaging.
What a text answering service does
Text answering covers two jobs that often get mixed up:
- Answering inbound texts. A customer texts your business number instead of calling: "Are you open Saturday?" or "Is the 2-bedroom on Elm still available?" Someone, or something, has to reply in that thread.
- Following up calls by text. After a call, the caller gets a text with what was agreed: the appointment time, the address, the next step. The text becomes a record they can find later and reply to.
Both need two-way texting: a business number that can send and receive messages, and a reply that lands in the same conversation. A text answering service is not the same as missed-call text back, which only sends a template after an unanswered call. The missed call text back comparison covers that tool and where it falls short.
What customers expect when they text a business
A customer who texts has chosen a channel that feels quick and low-effort. In practice that sets four expectations:
- A reply in the same thread, not a call back from a different number or an email.
- A real answer, not "Thanks for your message, we will get back to you." If the question is about hours or availability, answer it.
- Short messages. One or two sentences, one link at most, and your business name so they know who is writing.
- A way out. If they ask you to stop, you stop. More on the rules below.
Speed matters here the same way it does on the phone. A lead who texts three businesses about a rental can easily go with the first useful reply and never read the other two. The speed to lead guide and how to respond to real estate leads have scripts for those first messages.
What you can automate and what you should not
| Message type | Automate? | Why |
|---|---|---|
| Follow-up text after a call (time, address, next step) | Yes | It repeats what was agreed on the call, and the caller asked for it |
| Answers to routine questions (hours, availability, prices) | Yes | The answer comes from your own information and is the same every time |
| Booking confirmations and reminders | Yes | The customer asked for the appointment; reminders help them keep it |
| Opt-out confirmations | Yes | One confirmation, then nothing more; it has to work every time |
| Complaints, disputes, sensitive news | No | These need a person who can make a decision and take responsibility |
| Promotional blasts | Only with written consent | Promotional texts need the customer's prior agreement and an opt-out in each message |
The pattern is simple: automate the messages that confirm or answer something the customer started, and keep a person on the ones that need judgment.
Before you switch anything on, write the replies down. List the ten questions your customers text most, the answer to each in one or two sentences, and the point where the thread goes to a person. Add your business name to the first message of every thread, because a text from an unknown number with no name looks like spam. Then send each automated message to your own phone and read it the way a customer would: is it clear what happens next, and is it obvious how to reach a person?
A sample call and text follow-up
Sample: a call, then the text thread
The caller now has the time and address in writing, and a thread to ask follow-up questions without calling again. If they reply "actually, can we do Sunday?", that is a person's call or a booking rule, decided in advance.
Call it, then check the follow-up text
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10DLC registration for business texting
In the US, a business texting customers from a standard local number is sending what carriers call application-to-person (A2P) traffic over 10DLC, short for 10-digit long code. The Campaign Registry describes 10DLC as an A2P channel where brands and their messaging providers are verified before messages are sent, and it says businesses cannot register with it directly: registration goes through your messaging provider.
- 1
Register your brand
Your business, identified by its legal name and federal tax ID. AT&T's registration guide warns that the legal name and tax ID must match exactly or the application is rejected. - 2
Register a campaign
A description of how you use texting, for example customer care or appointment reminders, with sample messages and how customers opt in. - 3
Assign your numbers to the campaign
The numbers you text from are linked to the approved campaign. AT&T says texting on existing numbers is disabled until that is done.
AT&T also notes a one-time brand registration fee, charged whether the brand is accepted or not, with campaign fees that vary by campaign type. Ask any texting or answering provider who handles registration, who pays the fees, and how long approval takes before you plan a launch date around it.
Consent and opt-out rules
Two sets of rules apply: the carriers' industry guidelines and federal law.
- Conversational replies. The CTIA Messaging Principles and Best Practices (May 2023) say that when a customer texts first and the business only responds with relevant information, no further permission is expected.
- Informational texts. Appointment reminders and alerts need the customer to agree to texts for that purpose when they give you their number.
- Promotional texts. CTIA says the customer should agree in writing before you send sales or marketing messages.
- Opt-out keywords. The FCC lists stop, quit, end, revoke, opt out, cancel and unsubscribe as standard revocation words, and revocation requests must be honored within a reasonable time not to exceed 10 business days (FCC 26-67, adopted September 30, 2026). That order also lets senders name an exclusive opt-out method, such as a reply with one of those words, once it takes effect.
- One confirmation, then silence. CTIA recommends a single opt-out confirmation and no messages after it. The FCC rules allow a confirmation text that only confirms the request, with no marketing in it.
Timing has a rule too. Under 47 CFR 64.1200(c)(1), telephone solicitations to residential subscribers are barred before 8am and after 9pm in the recipient's local time. Treat any marketing text the same way. A reply to a customer who just texted you at 10pm is a different thing: they started the conversation and are waiting for the answer.
When a person should take over the thread
Automated replies are right for confirmations and routine answers. Hand the thread to a person when the customer is upset, when money or a contract is in dispute, when the question needs a judgment call your rules do not cover, or when the customer asks for a person. Reply from the same number so the conversation stays in one thread, and answer within the hours you promised. The lead follow-up guide has a plan for the days after the first reply.