SMS Messages for Business: What They Are & How to Send Them

What Are SMS Messages? (And What They Aren't)

SMS ("short message service") is a plain-text protocol capped at 160 characters per segment, sent over a phone's cellular signaling channel rather than the internet. No images, no read receipts, no formatting — just text that lands in the native messaging app on any phone, smartphone or not.

That plainness is exactly why businesses use it. There's no app to download, no wifi dependency, and no algorithm deciding whether the message gets seen. Compare that to iMessage, WhatsApp, or Facebook Messenger — all app-based, internet-dependent, and invisible to anyone outside that ecosystem. SMS works on every phone, which is why it remains the default for appointment confirmations, delivery alerts, and one-time passcodes.

MMS is the cousin worth knowing about: multimedia messaging service, which allows images, GIFs, and longer text bundled into a single message. SMS vs MMS matters for cost and deliverability — MMS typically costs more to send and can render inconsistently across carriers, so most transactional and high-volume promotional sends still default to plain SMS unless a visual genuinely earns its place.

Businesses lean on both formats for two distinct jobs: transactional SMS (order confirmations, appointment reminders, shipping updates — expected, low-risk, high-utility) and promotional SMS (flash sales, restock alerts, cart recovery — valuable but subject to stricter consent rules, covered below).

Why Businesses Add SMS Messages to Their Marketing Mix

The oft-cited "98% open rate" for SMS is a vanity number worth treating skeptically — it usually just means the phone displayed a preview, not that anyone read or acted on it. More grounded industry benchmarks put SMS click-through rates in the low-to-mid single digits, varying by industry and list quality, per Messageflow's 2026 benchmarks. That's still often several times higher than typical email CTR, which is why SMS earns a place in the mix — just not as the miracle channel it's sometimes sold as.

Where SMS genuinely outperforms email is speed and specificity. A text about a delivery running late, a table confirmation in twenty minutes, or a cart with three items about to be released back into inventory gets read within minutes, not hours. Email is still better for storytelling, longer offers, and anything with visuals — the sms vs email marketing comparison isn't about replacing one with the other, it's about matching format to urgency.

The use cases that consistently earn their cost: appointment reminders (cuts no-shows dramatically for service businesses), abandoned cart nudges sent within an hour of drop-off, flash-sale alerts with a tight expiration window, and order/shipping status updates that reduce inbound support tickets. Anything that benefits from being seen in the next ten minutes is a strong candidate for SMS; anything that benefits from being read carefully belongs in email.

The Rules You Can't Skip: SMS Compliance Basics

The Telephone Consumer Protection Act (TCPA), enforced with FCC oversight, governs marketing texts in the US, and 2026 enforcement has sharpened around per-message liability rather than per-campaign. A single non-compliant blast to a purchased or unverified list can generate statutory damages multiplied by every recipient, not just a flat penalty — a detail well explained in ActiveProspect's TCPA guide.

The core requirement is prior express written consent before sending anything promotional — a checkbox at checkout or a signup form doesn't count unless it clearly discloses that the person is agreeing to receive marketing texts and that consent isn't a condition of purchase. Verbal consent or an email address alone is not sufficient for SMS.

Beyond consent, three operational rules matter daily: quiet hours (no promotional texts before roughly 8am or after 9pm in the recipient's local time zone), mandatory STOP-keyword opt-out handling on every send, and sender registration through A2P 10DLC (application-to-person messaging over standard 10-digit numbers) or a dedicated short code for higher volume, both overseen by carrier body CTIA. Skipping registration doesn't just risk fines — unregistered traffic gets filtered or blocked outright by carriers. MessageIQ's 2026 compliance guide covers the registration tiers in more detail for high-volume senders. For the parallel opt-out and footer requirements on the email side, see Evra's unsubscribe footer compliance checklist.

How to Actually Send SMS Messages to Customers

Sending compliant, effective bulk SMS messages comes down to six steps, in order:

1. Collect explicit consent. Capture it at the same moment you capture the phone number, with clear language about message frequency and opt-out instructions.
2. Segment the list. Reuse the same recipient framework you already apply to email — recent buyers, cart abandoners, VIP repeat customers — rather than building a parallel list from scratch. Evra's recipient segmentation framework works the same way for SMS as it does for email.
3. Write to the format. Lead with the offer or update in the first sentence, keep it under one segment when possible, and always include a clear opt-out line.
4. Register your sender. Complete A2P 10DLC registration before your first real send — this is a one-time setup step, not per-campaign.
5. Schedule within quiet hours. Time sends for the recipient's local zone, not yours.
6. Track replies and STOP requests. Replies matter for SMS in a way they rarely do for email — a "Y" or "yes" often confirms a booking, and STOP requests need to be honored immediately and permanently.

Following this sequence turns "how to send SMS messages" from a legal gray area into a repeatable, low-risk channel.

One Inbox or Two? Where SMS Fits With Your Other Tools

The strongest argument against a standalone SMS app isn't price — it's fragmentation. If SMS lives in one tool and email lives in another, every automation trigger (cart abandoned, appointment booked, order shipped) has to be built and maintained twice, and your view of a customer's engagement splits across two dashboards. Evra's piece on native vs. Zapier CRM integration walks through exactly how much that stitching costs in setup time and ongoing maintenance.

There's also a compounding cost to running more tools than you need — covered in Marketing App Overload and the real cost of point solutions vs. an all-in-one platform — separate logins, separate bills, and contact lists that quietly drift out of sync.

SMS earns its keep fastest when it shares contacts, consent records, and automation triggers with the email tool you already run — one abandoned-cart flow that fires an email at hour one and a text at hour three, from the same platform, off the same list. Evra builds SMS and email into a single subscription so that flow takes minutes to set up instead of a new integration to maintain.

Frequently Asked Questions

What's the difference between SMS and MMS messages?

SMS is plain text limited to 160 characters per segment, while MMS (multimedia messaging service) supports images, GIFs, and longer content bundled into one message. MMS generally costs more per send and can render inconsistently across carriers, so most businesses default to SMS unless a visual is essential to the message.

Do I need special permission to send marketing text messages to customers?

Yes — the TCPA requires prior express written consent before sending any promotional SMS, meaning the recipient must clearly agree to receive marketing texts, separate from simply providing their phone number. A vague checkout checkbox usually doesn't meet this standard, and non-compliant sends carry per-message statutory damages.

How many characters can one SMS message contain before it splits into two?

A standard SMS segment holds 160 characters using basic GSM encoding; going over that splits the message into multiple linked segments, which most carriers bill and send as separate messages. Using emoji or certain special characters lowers that limit to 70 characters per segment.

Is SMS marketing actually more effective than email marketing?

SMS typically gets higher click-through rates than email, but the widely quoted 98% open rate is a vanity metric that doesn't reflect real engagement. The two channels serve different purposes — SMS for time-sensitive, short updates and email for detailed offers — so the most effective mix uses both together rather than replacing one with the other.

Can I send SMS messages using the same list I use for email?

You can use the same underlying customer segments, but SMS requires its own separate consent record — email opt-in does not cover SMS opt-in under the TCPA. Once both consents are captured, running SMS and email off one shared contact list keeps segmentation and reporting consistent.

What happens if someone replies STOP to a marketing text?

Replying STOP must immediately and permanently unsubscribe that phone number from future promotional messages, per TCPA and carrier requirements enforced through CTIA guidelines. Failing to honor STOP requests promptly is one of the most common — and most penalized — compliance failures in SMS marketing.