SMS marketing is sending text messages to customers who agreed to hear from your business. The sending part is simple, but what happens between your campaign tool and a customer's phone decides whether the message lands, gets read or gets filtered.
What SMS marketing is, and what it is not
SMS marketing is permission based messaging. A customer gives your business their mobile number and agrees to receive texts. You then send messages that have value to them: a sale, a restock, an appointment reminder, a shipping update, an answer to a question. The channel is the same one friends and family use, which is why it gets attention and why it has rules.
It is not cold outreach. Buying a list of numbers and texting strangers is not SMS marketing. It is spam, and in the US it can trigger carrier blocks and legal exposure under the TCPA. It is also not a one way broadcast. Customers can reply, and a good program expects that.
Most business texting falls into one of two groups. Promotional messages try to drive a purchase or a visit. Transactional messages confirm something the customer already did, like an order or a login code. Both ride the same rails, but promotional traffic carries stricter consent expectations.
How a business text reaches a phone
When you press send, your message does not go straight to the customer's handset. It goes to a messaging platform, which hands it to a route, which hands it to the customer's mobile carrier (AT&T, T-Mobile, Verizon and the smaller carriers behind them). The carrier delivers it to the phone and sends back a delivery receipt.
Three pieces matter here. The number is the sender identity: it is what the customer sees and what carriers register and score. The route is the path between your platform and the carrier, and routes differ in speed, cost and reliability. The carrier is the gatekeeper. It filters messages that look like spam, come from unregistered numbers or break its content rules.
Application to person (A2P) traffic, which is any text sent by software rather than a person typing on a phone, is treated differently from person to person texting. Carriers expect A2P senders to register, to use approved number types and to honor opt outs. Unregistered A2P traffic from a plain local number is the fastest way to get filtered.
The three number types
Toll free numbers start with 800, 888, 877, 866, 855, 844 or 833. They are the simplest way for a US business to start texting at volume. You submit the number for toll free verification once, with your business details and a description of your use case, and then you can send verified traffic at higher throughput than an unverified number. Customers recognize toll free numbers, they can call them for free, and the same number works for two way conversations. Xeebi's Toll-Free Numbers run at $0.009 per message, all in.
10DLC stands for 10 digit long code: a standard local number (a 949 or 212 number, for example) registered for A2P use. Registration has two layers: your brand, which is your business identity, and your campaign, which describes what you will send. Local numbers feel personal and fit businesses that serve one area or want a local presence. Throughput depends on how your brand and campaign are scored during registration, so check the current carrier requirements before you plan volume. On Xeebi, 10DLC messaging is $0.008 per message. The pricing page shows how both rates price out at your monthly volume.
Short codes are five or six digit numbers, like 12345. They offer the highest throughput of the three and are easy to remember, which makes them a fit for national brands, broadcast campaigns and high volume alerts. They are leased rather than bought, carriers approve each program before it goes live, and the setup takes longer and costs more than toll free or 10DLC. If you think you need one, contact sales and we will walk you through it.
Consent and STOP, in plain terms
Consent means the customer agreed to receive texts from you before you sent one. In practice, that is a checkbox on a form, a keyword texted to your number, or a written opt in at the register. Record what they agreed to, when and how, because carriers and regulators can ask. Say in the opt in what kind of messages they will get and roughly how often.
STOP is the universal opt out. When a customer replies STOP (or a similar word like UNSUBSCRIBE, CANCEL, END or QUIT), you confirm once and never text them again from that program. HELP should return your business name and a way to reach you. Put "Reply STOP to opt out" in your first message and on a regular basis after that.
Two more habits keep a program healthy. Respect quiet hours, because a text at 3 a.m. is a complaint waiting to happen. And keep your list clean: numbers change hands, get deactivated and move between carriers. A Number Lookup pass before a send catches a lot of that.
This is practical guidance, not legal advice. The TCPA, state laws and carrier rules change, so talk to counsel about your specific program.
What a first campaign looks like
A first campaign is small on purpose. Pick one audience that clearly opted in, one message with one action, and one way to measure whether it worked.
- Audience: customers who opted in recently, scrubbed for deactivated numbers and Do Not Call flags.
- Message: your business name first, one sentence of value, one link or instruction, and the opt out line. Under 160 characters if you can.
- Timing: a weekday, mid morning or early afternoon in the customer's time zone.
- Measurement: deliveries, replies, link clicks and opt outs, all in one place.
Send it, read every reply, and look at the opt out count the next morning. If opt outs are high, the audience was wrong or the message was off. If replies are high, make sure someone answers them. A campaign manager like Mobius handles the sending, the replies and the link tracking in one place, from a few hundred contacts to a few million.
When SMS is the wrong tool
SMS is short, immediate and personal. That is its strength and its limit.
It is the wrong tool for long content. A text that needs three screens of scrolling should be an email, or a web page with a link in the text. It is wrong for anything you have not been given permission to send, and no number type or route fixes that. It is wrong for sensitive information that should not sit in a message thread, like full account numbers or medical details, unless you have the compliance program to support it. And it is wrong as a daily habit: a brand that texts every day trains customers to reply STOP.
Used with restraint, it is the most direct line a business has to a customer. That is the argument in why SMS is the crown jewel of marketing in 2026. If you want to try it, get started with a toll free number and a short list, and build from there.
Frequently asked questions
Do I need the customer's permission to send marketing texts?
Yes. In the US, promotional texts require prior consent, and carriers expect you to keep a record of it. Talk to counsel about the specifics for your program.
Which number type should a small business start with?
A toll free number is the simplest start: one verification, two way texting and a number customers recognize. 10DLC fits a local presence, short codes fit national volume.
What happens when a customer replies STOP?
You send one confirmation and stop texting that number from that program. Every platform you use should handle this automatically.
How long should a marketing text be?
One message segment, 160 characters, is the target. Business name, one point of value, one action and the opt out line.
