SMS Marketing for Small Business: Consent, Timing and Copy That Works

A text message lands in the same place as a message from a friend, a partner or a school. It buzzes in a pocket, it is usually read within minutes, and it feels personal. That is exactly why SMS works for small businesses, and exactly why getting it wrong costs more than getting email wrong. A badly judged email is deleted. A badly judged text is remembered, and often answered with STOP.

This guide covers the parts that decide whether SMS helps or hurts: getting proper consent, understanding the difference between transactional and promotional messages, choosing sensible send times, writing within the limits of a text, handling replies, and measuring what matters. It is a practical guide, not legal advice. The rules differ by country and by state, so check the ones that apply to you.

Key takeaways

Why SMS is different from email

People notice texts quickly, which suits anything time-sensitive and punishes anything irrelevant. There is no subject line or layout, and leaving takes one word, sometimes a spam report that can harm your ability to send at all. It rewards restraint: a small, well-targeted, clearly consented list usually beats a large, cold one, with much less risk.

Consent: the foundation

Before anything about copy or timing, you need permission. The common concept in many places is some form of express consent: the person has clearly and knowingly agreed to receive text messages from your business. For marketing messages that agreement is usually expected to be explicit and in writing, which in practice includes a ticked box on a form or a reply to a clear opt-in text.

Buying a list, scraping numbers from a website, or assuming that because someone gave you their phone number for an order they want promotions are the habits that cause trouble. A phone number given for one purpose is not automatically permission for another.

What a proper opt-in looks like

• An unticked checkbox. A pre-ticked box is not a clear choice.
• Plain wording and honest frequency. Say what they will get, such as appointment reminders and occasional offers, and roughly how often. Only promise what you will do.
• Standard notices. Message and data rates may apply; reply STOP to opt out; reply HELP for help.
• Links to your terms and privacy policy beside the checkbox.

Keep proof of consent

For each contact, keep the date and time of the opt-in, where it happened (which form, page or keyword), the exact wording they saw, and any later opt-out with its date. A contact record with a clear consent note is far more useful than a spreadsheet column that just says “yes”.

The rules depend on where you operate

Laws and industry rules vary by country, and in some countries by state or province. A few examples of what you may run into:

• United States. The Telephone Consumer Protection Act (TCPA) governs automated and marketing texts, and carriers add their own rules. Businesses texting US numbers are generally expected to register their sender and campaign use with the carriers, a process commonly called 10DLC registration, if they use a standard local number. Some states add their own restrictions on top.
• United Kingdom. The Privacy and Electronic Communications Regulations (PECR) cover electronic marketing, alongside UK data protection law.
• European Union. GDPR and national ePrivacy rules affect how you collect contact data and consent. Many other countries have do-not-call registers or sender registration rules too.

These descriptions are deliberately brief and may be out of date by the time you read them. Check the rules for every country where your recipients live, ask your carrier or messaging provider what registration they require, and take advice from a qualified professional if you are unsure. You, as the business sending the messages, remain responsible for compliance.

Transactional versus promotional messages

Most rule sets draw a line between messages that serve something the customer has already asked for and messages that try to sell something. The line is not always where owners expect it, so it pays to think about it deliberately.

A useful habit: if a message contains a promotion, treat it as promotional, even if it also contains a reminder. And if a customer only agreed to booking reminders, do not use that permission to send offers. Ask for the second permission separately and clearly.

Timing: hours, time zones and frequency

Quiet hours

Many places restrict the hours in which marketing texts may be sent, and even where they do not, a message at 11pm or 6am is a fast way to earn an opt-out. A conservative default is to keep promotional texts to reasonable daytime and early evening hours in the recipient’s local time, and to avoid early mornings, late evenings and, for most businesses, holidays.

Think in the recipient’s time zone

If your customers are spread across more than one time zone, a message scheduled for 9am in your office may land at 6am for them. Either send to separate groups at different times or choose a send window that is comfortable everywhere. Check the rules for any state or country you send into, since some set their own limits on hours.

Match the moment

Send reminders early enough to act on, offers when there is a real reason to read them, and review requests soon after the visit. Treat these as starting points to test with your own customers.

Frequency: fewer, more relevant

There is no correct number of texts per month, but there is a clear direction: less often than you think, and tied to something the recipient cares about. A customer who gets a useful reminder every few weeks and an occasional offer will tolerate it. A customer who gets three promotions a week will leave, and some will report you. Whatever you promised on the opt-in form is your ceiling, not your target.

Message anatomy: what fits in a text

Characters and segments

A single standard text is limited to 160 characters when it uses the common GSM-7 character set, which covers basic letters, numbers and everyday punctuation. If your message includes characters outside that set, such as emoji, curly quotation marks or many accented characters, the message is typically sent as Unicode, and a single segment holds far fewer characters, commonly 70.

Longer messages are split into segments, and each segment is usually billed as a separate message. Joined segments also carry a little overhead, so the per-segment limit drops slightly once a message runs past one. In practice:

Aim for one segment where you can. A single emoji or curly apostrophe pasted from a document can switch the whole message to Unicode and double the segment count, and merge fields expand to different lengths, so preview the counts with your longest names before sending to a list.

Links

Links in texts attract scrutiny. Public link shorteners are widely used by spammers, and carriers may filter messages that contain them. Use a link on a domain that clearly belongs to your business, keep it to one per message, and make sure the page works well on a phone. Carriers do not publish all their filtering rules, so no sender can guarantee delivery. Clean consent, a recognisable sender and relevant content are your best defence.

Copy that works: one message, one job

Because there is so little room, a good text has a simple structure. It answers four questions in the order the reader asks them.

• Who is this? Start with your business name, so there is no doubt why this number is texting.
• Why now? One reason, specific to the person or the moment.
• What do I do? One action. If there are two choices, you have written two messages.
• Where? One link, or one thing to reply with.

Write like a person, not a poster: no capital-letter shouting or strings of exclamation marks. Keep any opt-out line short, such as “Reply STOP to opt out”.

Example messages

These are illustrative examples to adapt, not templates to copy blindly. The business names and details are made up, and your own opt-in wording and local rules should shape the final text.

Appointment reminder (transactional)

Abandoned quote nudge

Review request

Offer to existing customers

Win-back

The examples share a clear sender, one reason, one action and no pressure. An offer message is only honest if the offer is real, so do not invent deadlines.

Two-way conversations

Unlike a newsletter, texts get replies. If they come from a number nobody monitors, you have turned a conversation channel into a loudspeaker.

Decide who answers and during which hours, reply within minutes where you can, and make sure whoever replies can see the contact's earlier messages and bookings so nobody has to repeat themselves. If an answer needs a long explanation, offer a call or email.

Segments instead of blasts

The easiest way to make texting feel relevant is to stop sending the same message to everybody. Even two or three simple segments change the results.

A message to a hundred people who all have a reason to read it beats one to a thousand who mostly do not, with fewer opt-outs.

Handling opt-outs properly

When someone replies STOP, stop. Treat STOP, END, CANCEL and UNSUBSCRIBE as opt-outs, send at most one confirmation, and exclude the person from every future campaign. Apply opt-outs everywhere your contact list lives, because a number that texts STOP in one tool and gets messaged from another is the classic way to generate complaints. If you use a messaging provider, find out what it handles and what you must still do yourself.

Measuring what matters

Delivery counts and sent counts are the least interesting numbers. A more useful set looks like this:

Track replies (and whether they are positive, questions or complaints), link clicks, opt-outs per message rather than in total, and the outcome you wanted, whether bookings, sales or reviews. Then work out the message cost per outcome so you can compare SMS honestly with other channels.

Change one thing at a time, such as the send time, the offer or the wording of the action, and compare like with like. With small lists, treat differences as hints rather than proof, and keep notes of what you tried.

Using SMS and email together

Use email for depth and SMS for nudges. Avoid sending the identical offer by both channels in the same hour, use the second channel as a softer follow-up, and honour each channel's opt-out separately.

Common mistakes

• Texting people who never opted in, or using pre-ticked boxes and vague wording.
• Mixing transactional and promotional messages, such as sneaking a sale into a reminder.
• Ignoring time zones and quiet hours.
• Pasting in curly quotes and emoji, which silently inflates segment counts.
• Sending from an unmonitored number, so replies go unanswered.
• Counting sends as success and skipping sender registration where it is required.

How Scalry handles this

In Scalry, campaigns can be email or SMS, and an SMS campaign has its own SMS body, so you write the text separately rather than squeezing an email into it. You can keep a campaign as a draft while you work on it, schedule it for a chosen time, send it, pause it, or cancel it, which gives you room to change your mind before a message goes out.

Contacts are grouped into campaign lists, and you can target a campaign with segments, so the people who booked and the leads who asked for a quote can get different messages instead of one blast. Links in campaigns are tracked, and events are recorded per recipient, so you can see who clicked rather than just how many messages left.

SMS conversations, including replies, appear in the shared inbox with the contact’s history alongside, which helps whoever picks up a reply see what has already happened. Review requests can also go out by SMS, so the follow-up after a finished job can run the same way as the rest of your texting. Plans include SMS send allowances, so check your plan for the current limits.

One boundary to be clear about: Scalry gives you the tools to organise and send, but you remain responsible for compliance. That means getting and keeping proper consent, following the rules in the places you send to, and completing any sender registration your carriers or your country require. Scalry does not promise that any message will be delivered.

Questions to ask before you commit

Whichever way you are leaning, these are the questions that change the answer. Work through them against your own numbers rather than anyone's feature matrix — including this one.

• Can we show, for every number, when and how the person agreed to texts? If not, pause marketing messages until you can.
• Who answers replies, and how quickly?
• Which outcome do we measure: bookings, replies or just sends?

If you cannot answer the first three, you are not ready to choose between Scalry and your current texting yet — you are still deciding what you need, which is a cheaper problem to solve first.

A short plan to start well

In week one, review where phone numbers come from, fix your opt-in wording and check the rules and registration steps that apply to you. In week two, write one transactional and one promotional message, check the segment count and test on your own phone. In week three, send to one narrow, consented segment and answer every reply. In week four, compare bookings and opt-outs, change one thing and repeat.

Frequently asked questions

Do I need permission to text customers?

Generally yes for marketing messages. Most rules expect clear, recorded consent, often in writing, and a number given for one purpose is not automatically permission for another. Rules differ by country and state, so check yours. This is not legal advice.

What should an SMS opt-in include?

An unticked checkbox, plain wording about the type of messages and roughly how often you will send them, a note that message and data rates may apply, how to opt out by replying STOP, how to get help by replying HELP, and links to your terms and privacy policy. Keep a record of when and where each person agreed.

What is the difference between transactional and promotional texts?

Transactional texts deliver something the customer expects, such as a booking confirmation or an appointment reminder. Promotional texts try to sell, such as an offer or a win-back message. They are often treated differently, and a message that includes a promotion is best handled as promotional.

How long can a text message be?

A single segment holds 160 characters in the standard GSM-7 character set. Emoji and some punctuation or accented characters switch a message to Unicode, where a segment holds about 70. Longer messages are split into segments that are usually billed separately, so preview the segment count before sending.

When is the best time to send marketing texts?

Within reasonable daytime and early evening hours in the recipient's own time zone, and within any legal limits where they live. Avoid early mornings, late evenings and holidays. Treat any advice about the best hour as a starting point to test with your own customers.

Can I use a link shortener in my texts?

It is best to avoid public shorteners. They are common in spam and carriers may filter messages that contain them. Use a link on a domain that belongs to your business, and keep it to one link per message. No sender can guarantee delivery.

How do I know if SMS marketing is working?

Look past the number of messages sent. Track replies, link clicks, opt-outs and the outcome you wanted, such as bookings, sales or reviews, and compare the cost per outcome with your other channels. A rising opt-out rate after a particular message is a signal to change it.