In short
- Inquiry follow-up needs two-way business SMS: a local, toll-free or text-enabled landline number that accepts replies. An alphanumeric sender ID shows your name, but recipients cannot answer it.
- In the US, a 10-digit business number must be registered for A2P 10DLC, and a toll-free number must pass verification before it can text the US or Canada.
- Under CTIA's US guidelines, replying to a lead who texted you first needs no extra permission, a form lead should agree to texts about their request, and promotional texts need express written consent.
- The first text should arrive within minutes, use the lead's name, ask one question and say how to opt out. Follow-ups on an unanswered inquiry should have a planned end.
Business SMS is texting from a number that belongs to your company, sent and answered through software your whole team can see, instead of from someone's personal phone. For a team that lives on inbound inquiries, its most valuable use is not mass promotion. It is the reply: a lead fills in your form at 9:40 pm, and within a minute a text lands on their phone that uses their name, mentions what they asked about, asks one useful question and offers a next step.
This guide is about setting that up properly. You will see which kind of number to get (and which kind to avoid), what registration carriers expect, how consent works when the lead contacted you first, and how to write first replies and follow-ups that turn text message leads into booked calls and visits.
What business SMS means for a team that answers inquiries
People use "SMS for business" for two very different jobs:
- Broadcast texting: one message to a list, such as an offer or an alert. Replies are an afterthought.
- Two-way texting: a conversation with one person at a time, usually started by them through a form, an ad, a social message or a call you could not take.
A team that handles inquiries needs the second kind, and that changes what you buy. The number has to accept replies. Every reply has to land somewhere a person (or an AI) will see it within minutes. And the full history has to be visible to whoever picks up the conversation next.
It also changes how the phone networks see you. The CTIA Messaging Principles and Best Practices, the guidelines US wireless carriers work from, treat texts a business sends as non-consumer traffic even when the volume is low and the conversation is one to one. That is why registration and consent rules apply to a two-person clinic just as they do to a national brand.
Choose a sender type that can take replies
Before you compare providers, decide what kind of sender customers will see. These are the common options:
| Sender type | Can people reply? | Good for | What to know |
|---|---|---|---|
| Local 10-digit number (10DLC in the US) | Yes | Inquiry conversations, local businesses | In the US it must be registered for A2P 10DLC before you send |
| Toll-free number (800, 888 and similar) | Yes | Businesses that serve a whole country | Cannot text the US or Canada until toll-free verification is approved |
| Your existing landline, text-enabled | Yes | Businesses whose number is already on the website, signs and vans | Calls stay with your phone company, texts go to your messaging software |
| Short code (5 or 6 digits) | Yes | High-volume programs such as flight delays or delivery alerts | Has its own registry and handbook, more than most small teams need |
| Alphanumeric sender ID (a name instead of a number) | No | One-way alerts in countries that allow it | Not available in the US or Canada, and useless for conversations |
The last row is the common trap. An alphanumeric sender ID looks polished because the text shows your company name, but Twilio's documentation is plain about it: recipients cannot reply, so you also need another way for them to opt out. For lead follow-up that defeats the purpose, because the reply ("Thursday after 4 works") is the reason you texted.
How to get a business SMS number, step by step
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Decide which number customers should see. If your landline is already printed everywhere, consider text-enabling it so people can text the number they already know. In the US and Canada, Twilio calls this a hosted number: voice stays with your current provider, mobile numbers are not eligible, a number already enabled for texting elsewhere cannot be used, and the owner verifies the number and signs a letter of authorization. Twilio says a landline takes up to one business day and a toll-free number two to three, but also that its current hosted-number API is being replaced by a new version, so ask your provider what it supports today. Otherwise, get a new local number in your own area code.
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Pick software built for conversations. You need a shared inbox, a way to assign a conversation to one person, and connections to your lead sources. A bare messaging API only works if you have a developer.
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Register the number before you send anything. In the US, anyone texting from an application over a 10-digit number must register for A2P 10DLC. That means a brand (who you are, and standard brands need a tax ID) and a campaign (what you send and how people opt in, opt out and get help). Unregistered traffic pays extra carrier fees and is filtered more heavily. A sole proprietor brand is lighter to set up but limited, for example to one campaign and 1,000 SMS segments a day to T-Mobile. A toll-free number cannot text the US or Canada at all until toll-free verification is approved. Outside North America the rules vary, and some countries require senders to be registered, so ask your provider before launch.
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Add texting wording to every form. Next to the phone field, say that you will text them about their request, from which number, who you are and how to stop. The consent section below explains why.
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Connect every lead source. The first text should fire on its own when a lead arrives from an ad lead form, your website form, chat or a social message. If someone has to copy a phone number from an email notification into a phone, the setup will break on the first busy afternoon.
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Test it from your own phone. Submit your own form, reply with a question, then reply "stop" in lowercase. Check that every reply shows up in the inbox and that the opt-out is recorded.
Two-way business SMS: the reply is the product
Once the number works, the conversation is where inquiries are won or lost.
Answer in minutes, at any hour. Inquiries arrive in the evening and on weekends, when nobody is at the desk. A first reply that waits until 9 am competes with every other business the lead contacted overnight.
Ask one question per text. A text with five questions gets one answer, usually to the easiest. Pick the question that decides what happens next: is it urgent, where is it, how big is it, which date.
Offer a concrete next step. "Want to book a call?" is weaker than "I can call you at 4:30 today or 10:00 tomorrow. Which works?"
Keep a person within reach. Some conversations should leave automation early: the customer asks for a person, complains, describes a complicated case or is ready for a big purchase. Route those to a named team member and tell the customer who will contact them and when.
Keep one shared history. If the lead texts back three days later, whoever answers should see the whole thread.
SMS lead follow up: first-reply templates and a rhythm for silence
A good first text has five parts: their name, who you are, what they asked about, one question and how to stop. CTIA expects senders to state in the message which words opt someone out, which is why each template ends with the STOP line. Replace the braces with your own details.
| Situation | First text |
|---|---|
| Home services, website form | Hi {name}, this is {agent} at {business}. Thanks for your request about the {job}. Is it urgent, or can it wait a few days? Reply STOP to opt out. |
| Clinic or salon, ad lead form | Hi {name}, it's {agent} from {business}. You asked about {treatment}. Do weekday mornings or late afternoons suit you better? Reply STOP to opt out. |
| Real estate, listing inquiry | Hi {name}, {agent} from {business} here. You asked about {address}. Would you like a viewing this week, or are you early in your search? Reply STOP to opt out. |
| Course or school, information request | Hi {name}, this is {agent} at {school}. Thanks for asking about {course}. Are you aiming for the {month} start or a later one? Reply STOP to opt out. |
| Car dealer, vehicle inquiry | Hi {name}, {agent} at {dealer}. You asked about the {model}. Would a test drive on a weekday evening or on Saturday work better? Reply STOP to opt out. |
When a lead goes quiet, follow up on a plan. A reasonable starting rhythm:
- Same day, a few hours later: a short nudge that adds something useful, such as "We have a slot Thursday morning if that helps."
- Next day: a different angle, such as "Would a quick call be easier than texting?"
- Two or three days later: a polite close, such as "I'll leave it here for now. Just reply to this number whenever it suits you."
Then stop. Send these nudges in normal waking hours for the lead's time zone, and stop at once if they opt out.
Text message leads and consent: the rules that matter
This section is not legal advice, but the industry rules are clearer than many people expect.
In the US, CTIA's guidelines, which sit alongside laws such as the TCPA and FCC regulations, sort business texts into three kinds:
- Conversational: the consumer texts you first and you reply with relevant information. CTIA calls this implied consent: no further permission is expected.
- Informational: the consumer gives you their number and asks to be contacted. They should agree to texts for that specific purpose when they hand over the number, and that agreement can come through a form, a website, a text or verbally.
- Promotional: a sales or marketing message. It needs express written consent, such as a checked box. CTIA warns that adding a call to action like a coupon code to an informational text can make it promotional.
For inquiry follow-up that means three things. A lead who texts your number first can simply be answered. A lead who fills in a form should see clear wording next to the phone field. And your replies should stay about their request, because slipping a discount into a follow-up moves it into the promotional category.
CTIA also expects you to:
- Act on opt-outs written in normal language (stop, end, unsubscribe, cancel, quit, "please opt me out") regardless of capitals or punctuation, send one confirmation, and then send nothing more.
- Keep consent records: when it was given, how (form, keyword, call), the wording the person saw, the phone number and who gave it.
- Never text lists that were bought, rented or shared.
In the EU, the ePrivacy Directive defines electronic mail as any text, voice, sound or image message sent over a public communications network, so a marketing text counts. Direct marketing that way needs prior consent, with a narrow exception for your own existing customers and similar products or services, and they must be able to object easily and free of charge. Marketing messages must never hide who sent them and must give a valid way to ask you to stop. Replying to someone who just asked you to contact them is a different situation from unsolicited marketing, but national laws add their own detail, so check the rules where you operate.
Where AI fits in business text messaging
The weakest link in most setups is not the number. It is the gap between a lead arriving and someone replying. That gap is where AI earns its place: it can send the first text within seconds at any hour, ask the qualifying questions you chose, keep the follow-up rhythm above without anyone remembering it, and offer real times from your calendar.
Tools such as Konverto work this way. They pick up new leads from Facebook and Instagram lead ads, website forms and website chat, reply by SMS and email in your own tone, and send a follow-up if the lead goes quiet. When the lead is ready, the AI books a call or a site visit into your calendar. SMS, email and website chat leads share one inbox for the team, and Konverto hands the conversation to a person when a lead asks for one or a call-back, or raises a complaint.
Whatever you use, test it like a new hire. How fast is the first reply? Does it ask one useful question at a time? Does it stop on STOP? Can your team take over mid-conversation without losing the thread?
Business SMS setup checklist
Run through this before you send the first text to a real lead:
- The sender accepts replies (no alphanumeric sender ID for lead conversations).
- In the US, the number is registered for A2P 10DLC, or the toll-free number is verified.
- Every form with a phone field says you will text about the request, from which number, and how to stop.
- Every lead source triggers the first text automatically, day and night.
- The first text uses the lead's name, says who you are, refers to their request, asks one question and includes the STOP line.
- Unanswered inquiries get a planned follow-up rhythm with a clear end.
- Opt-outs in any wording are honored, confirmed once and recorded.
- Consent records are kept: time, method, wording and phone number.
- Conversations that need a person (a request for a human, a complaint, a complicated case, a big purchase) are routed to a named team member.
- The whole team works from one shared inbox, so nobody answers blind.
Get those ten points right and business SMS stops being a broadcast channel and becomes what inquiries actually need: a fast, polite conversation that ends in a booked time.
Frequently asked questions
How do I get a business SMS number?
Choose a provider that supports two-way texting, then either get a new local or toll-free number or ask whether your existing landline can be text-enabled. In the US, register a local number for A2P 10DLC (a brand and a campaign) or complete toll-free verification before you send. Outside North America, ask the provider whether your country requires sender registration.
Can I text customers from my existing business landline number?
Often, in the US and Canada. Some providers can add texting to a landline or toll-free number while calls stay with your phone company. Twilio, for example, requires ownership verification and a signed letter of authorization, excludes mobile numbers and numbers already enabled for texting elsewhere, and says a landline takes up to one business day.
Do I need permission to text a lead who filled in a form?
Under CTIA's US guidelines, someone who gives you their number and asks to be contacted should agree to texts for that purpose when they hand it over, so put clear wording next to the phone field. If they texted you first, replying with relevant information needs no extra permission. Marketing texts need express written consent. This is not legal advice, so check the law where you operate.
Can customers reply to a business text message?
Only when it comes from a phone number or a short code. Texts sent with an alphanumeric sender ID, where your company name appears instead of a number, are one-way, and that sender type is not available in the US or Canada at all.
What is 10DLC registration and do I need it?
A2P 10DLC is the system US carriers use for business texts sent from ordinary 10-digit numbers. Anyone sending from an application over such a number to US phones must register a brand (who you are, with a tax ID for standard brands) and a campaign (what you send and how people opt in and out). Unregistered traffic gets extra carrier fees and more filtering.
What should the first text to a new lead say?
Keep it short: the lead's name, who you are, what they asked about, one question that decides the next step, and how to opt out, such as 'Reply STOP to opt out.' Send it within minutes of the inquiry, not the next morning.
Sources
- CTIA: Messaging Principles and Best Practices (May 2023), business texts as non-consumer traffic, consent levels for conversational, informational and promotional messages, opt-out handling and consent records (read 6 November 2026)
- Twilio Docs: What is A2P 10DLC, who must register, brand and campaign registration, sole proprietor limits and fees for unregistered traffic (read 6 November 2026)
- Twilio Docs: Toll-free verification, no SMS to the US and Canada from a toll-free number until verification is approved (read 6 November 2026)
- Twilio Docs: Alphanumeric sender IDs, one-way messaging only, recipients cannot reply, not available in the US or Canada (read 6 November 2026)
- Twilio Docs: Hosted numbers, adding texting to an existing US or Canadian landline or toll-free number while voice stays with the current provider (read 6 November 2026)
- EUR-Lex: Directive 2002/58/EC (ePrivacy Directive), Article 2(h) definition of electronic mail and Article 13 on unsolicited communications (read 6 November 2026)