MarketingCategory 25 of 26

SMS / Text Marketing

Definition

An SMS marketing agency builds and runs text message programs: growing an opted-in subscriber list, designing campaigns and automated flows, and keeping everything inside consent law and carrier rules. Ecommerce brands are the core clients, because texting converts extraordinarily well and gets you sued extraordinarily fast when done wrong.

200 to 600

US entities

1,500 to 7,500 dollars

Typical monthly retainer

1 to 3 cents

Typical cost per message

We estimate 200 to 600 US entities in this category. Directional estimate, not a census figure.

How they make money

Agencies charge monthly retainers, commonly 1,500 to 7,500 dollars, scoped by campaign volume, flow builds, and list growth work. Some take a percentage of SMS-attributed revenue instead or on top, which demands scrutiny of the attribution window, since a text sent an hour before an organic purchase happily claims the credit. Platform and carrier costs are separate and land on you: the SMS platform subscription scales with list size, and each message carries per-send costs, typically around a cent or a few cents for SMS in the US, with MMS higher.

That per-message economics is the discipline of the channel. Unlike email, every send costs real money, so list hygiene and segmentation directly protect margin. A well-run program spends most of its revenue-generating energy on automated flows, welcome series, abandoned checkout, winbacks, which run continuously, while manual campaign blasts layer on top for launches and promotions. Ask any prospective agency what share of program revenue their clients get from flows versus blasts; the good ones answer instantly.

What good ones have in common

Compliance treated as engineering, not paperwork. Proper opt-in records, quiet hours enforcement, immediate honoring of opt-outs including plain-language replies, and correct 10DLC registration. TCPA suits are class actions with per-message damages, so this is existential.

List growth without list buying. Strong firms grow subscribers through site popups, checkout opt-ins, and email cross-promotion, all with compliant consent language. Purchased phone lists are illegal to text and radioactive.

Flow-first program design. The reliable money is in automated journeys triggered by behavior. An agency that leads with a blast calendar rather than flow architecture is running the channel like it is 2015.

Segmentation and frequency discipline. Texting everyone everything churns lists fast. Good agencies cap frequency, segment by engagement and purchase history, and track unsubscribe rate per campaign as a first-class metric.

Deliverability fluency. Carriers filter messages that look like spam, and registration, content, and volume patterns all affect it. Ask how they monitor delivery rates and handle carrier filtering; a real answer names specifics.

Honest attribution setup. They define attribution windows conservatively, deduplicate against email credit, and are willing to run holdout tests to show the program's true incremental revenue.

Red flags

Casualness about consent. If an agency suggests texting past customers who never opted in, or importing a list from anywhere, walk out. Statutory damages per message make careless texting one of the most expensive marketing mistakes available.

Revenue share on a generous attribution window. A long click-plus-view window credits the SMS program with sales it merely preceded. Pair any performance fee with tight windows and a holdout test.

Blast-only strategy. Daily promotional blasts to the full list produce a spike, then mass opt-outs, then a dead list. Frequency without segmentation is liquidating an asset you paid to build.

No 10DLC or registration answer. US carriers require registration of business texting campaigns, and unregistered traffic gets filtered or blocked. An agency that cannot explain your registration status is not actually operating the channel.

Ignoring the email relationship. SMS and email must coordinate on timing and offers or they cannibalize and annoy. An SMS agency that never asks about your email program is optimizing its silo at your expense.

How the category is changing

Regulation keeps tightening. Recent federal rule changes strengthened consumers' right to revoke consent by any reasonable means and shortened the window to honor it, while class action activity stays high, so compliance capability is becoming the primary reason brands hire specialists rather than running texts in-house. Carriers simultaneously tightened registration and filtering, which professionalized sending practices across the board.

On the product side, the channel is getting richer. RCS, the successor to SMS with images, branding, and interactive buttons, is finally reaching mainstream US phones and both major platforms, and agencies are beginning to test it for higher-engagement formats. Conversational and AI-assisted texting, where replies get answered automatically and shoppers complete support or purchase steps in the thread, is moving from novelty to standard offering. Per-message costs and list fatigue still discipline everything: the winning programs keep getting more targeted, not louder.

Frequently asked questions

How much does SMS marketing cost?

Agency retainers typically run 1,500 to 7,500 dollars monthly. Platform fees scale with subscriber count, and each SMS costs roughly a cent to a few cents to send in the US, with MMS costing more.

Is SMS marketing legal?

Yes, with express written consent from each recipient, honored opt-outs, and respect for quiet hours under the TCPA and state laws. Texting purchased lists or lapsed consent is illegal and carries per-message statutory damages.

What results does SMS marketing actually get?

Text messages get read at rates email cannot approach, and opted-in lists usually convert strongly on time-sensitive offers. The honest measure is incremental revenue from holdout testing, not platform-attributed revenue with generous windows.

How do I grow an SMS subscriber list?

Site popups with compliant consent language, checkout opt-ins, email cross-promotion, and keyword campaigns on packaging and social. Growth is slower than email but each subscriber is worth several times more. Never buy phone numbers.

How often should a brand send text messages?

Most successful ecommerce programs send a few campaigns per month plus behavior-triggered flows, and tune frequency by segment. Unsubscribe rate per send is the guardrail: when it climbs, frequency or targeting is wrong.

What is 10DLC and why does it matter?

Ten-digit long code, the US carrier registration system for business texting from standard phone numbers. Registration determines your throughput and whether carriers filter your messages. Unregistered business texting effectively no longer works.

Want the full directory of sms / text marketing?We are publishing full listings category by category. Leave an email and we will send this one when it goes live. Requests decide what publishes next.

One email per category. No newsletter.

SMS shops run the most intimate channel any of the marketing agencies touch, one buzz away from a customer's pocket, and the compliance-heavy operations behind it have them hiring reviewers and support staff through staffing agencies as programs scale.