Personalized text messaging at enterprise scale
Generated by Klaviyo AI
This guide explains how enterprise brands can use unified customer data to personalize text messaging across large subscriber lists. It covers SMS, MMS, and RCS formats, subscriber growth, campaigns and automations, cross-channel coordination, deliverability, and consent management in Klaviyo.
- Message formats: SMS supports time-sensitive plain-text messages, MMS adds visual media, and RCS enables interactive messaging with automatic SMS or MMS fallback in Klaviyo.
- Unified customer profiles: Klaviyo combines commerce, loyalty, support, and engagement data with channel-specific consent to inform segmentation and personalization.
- Subscriber list management: Separate SMS opt-ins, engagement-based segments, and tested sending cadences support list growth and retention.
- Coordinated customer journeys: Campaigns, automated flows, and two-way support conversations can work alongside other channels using shared customer data.
- Enterprise sending safeguards: Scaling requires attention to message throughput, carrier filtering, regional regulations, consent records, and recipients’ local quiet hours.
People spend an average of more than 5 hours a day on their phones, based on research from Harmony Healthcare IT, and mobile websites are now the most popular purchasing channel for retailers, hotels, restaurants, and wellness brands, according to Klaviyo’s 2025 Future of Consumer Marketing Report.
Because text messages show up on the device where consumers are already active, they can take a shopper directly from message to check-out, faster.
Effective text message marketing can drive immediate engagement, strong revenue, and direct communication that feels 1:1. According to Klaviyo’s 2026 Omnichannel Benchmark Report:
- Text messages drive revenue. The top 10% of SMS flows generate $5.26 in revenue per recipient (RPR) and an average order value of $365.
- Text messages influence repeat purchases. 80% of revenue from text message campaigns and 36% of revenue from text message flows comes from repeat buyers.
- Text messages are highly engaging. The top 10% of text message campaigns see a 10.44% click rate, about 3x the 3.38% click rate for the top 10% of email campaigns. The top 10% of text message flows, meanwhile, see a 16.6% click rate, 1.6x the 10.48% click rate for the top 10% of email flows.
As with all marketing channels, text messaging is simply another way for your customers to engage with your brand the way they want to. When you integrate it into your omnichannel marketing plan, it adds customer insights that makes your other channels smarter, too.
What is enterprise SMS marketing vs. RCS marketing vs. MMS marketing?
Enterprise SMS marketing is the practice of sending marketing text messages to large subscriber lists, often across regions, using the same customer data that powers your other channels.
At an enterprise scale, that requires accurate consent records for each individual subscriber across regions, capacity for peak seasons, and personalisation based on unified customer profiles.
Text message marketing is the channel, and SMS, MMS, and RCS are the formats you can send within that channel. Many enterprise brands use all 3, depending on the goal of each message:
- SMS: plain text, up to 160 characters per message. SMS works on virtually every mobile phone and delivers quickly, so it’s best suited for time-sensitive messages like flash sales, last-call reminders, and shipping updates.
- MMS: adds images, GIFs, and video. MMS costs more per message and sends more slowly than SMS, so it works best for visual launches and promotions to targeted segments.
- RCS: adds swipeable product carousels, call-to-action buttons, suggested replies, and a verified brand profile with your logo and name. A shopper can browse a new collection and tap through to buy without leaving the message thread, and the verified sender helps high-volume sends read as trustworthy.
In Klaviyo, RCS messaging runs on the same profiles, segments, flows, and reporting as any other message type, and falls back automatically to SMS or MMS on phones that can't receive RCS.
Unifying customer data for enterprise SMS marketing
Text messages are a personal channel, and brands need to earn their spot in someone’s contact list. 74% of consumers expected more personalised experiences in 2025, according to Klaviyo’s 2025 Future of Consumer Marketing Report, so personalising text messages based on a customer’s last purchase, loyalty status, and customer service history helps.
But when the data you need for personalisation is spread across your ecommerce platform, in-store point-of-sale (POS) systems, a loyalty programme, a helpdesk, and a subscription tool, you might text a discount on the jacket a subscriber bought in store yesterday.
Klaviyo brings data from all those sources across your complicated tech stack into one customer profile, with 350+ pre-built integrations feeding data into the built-in customer data platform (CDP) along with engagement and performance data from marketing and customer service. Segments, flows, and AI agents all read from that profile, so a text message can reflect someone's latest purchase, loyalty tier, or open support ticket.
Each customer profile also holds every subscriber's consent status by channel, which determines who can receive a promotional text and who’s only agreed to order updates.
Building and maintaining an enterprise SMS subscriber list
Growing your text message marketing list is a lot like building your list for other channels: you’ve got to make it worth your audience’s while. Be thoughtful about where, when, and how you ask for sign-ups, and think about what would make someone want to join your list.
SMS list growth strategies for enterprise brands
When you bring in new text message subscribers, make sure it’s always optional and collect consent separately from any other channel, like email. With Klaviyo, you can collect SMS opt-ins in several ways:
- Use multi-step sign-up forms. Ask for email addresses first, then phone numbers, so subscribers can choose how much information they want to share.
- Use AI to display your sign-up forms when they’re most likely to convert. When skincare brand Tata Harper used AI to test 20 placement and timing variations across desktop and mobile, they grew form submissions over 65% for both email and SMS.
- Allow shoppers to sign up for texts via a self-serve customer hub. Capture SMS opt-ins from engaged, logged-in customers when intent is already high.
- Target email subscribers with SMS-specific sign-up nudges. Email subscribers have already shown intent, so they may be more open to hearing from your brand via text message, too. Show text message-only pop-up forms to existing email subscribers, or send them a ‘Sign up for text messages’ email campaign.
- Use QR codes in physical retail locations. In-store signage can explain the benefits of signing up for text messages.
- Collect phone numbers at the point of sale. Ask for text message sign-ups at check-out, online or in-store. Online, make sure you leave the opt-in checkbox unchecked by default.
- Make sure your policy language is compliant. Next to the opt-in field, state your programme name (e.g., ‘Acme VIP Texts’), how often you'll text, that message and data rates may apply, and how to opt out (e.g., reply STOP). Link your mobile terms of service and privacy policy from your sign-up form.
SMS list retention strategies for enterprise brands
Start with engagement-based SMS segments and send different campaigns to each one. Your least engaged subscribers, for example, should only get your most important messages.
With Klaviyo, you can also segment on data from any source without custom integrations, and combine factors to reach smaller groups, like:
- Recent in-store shoppers: Customers who shopped in store in the past 60 days and subscribe to texts may respond to a complementary product or a new colour of something they already bought.
- Subscribers by sign-up source: People who joined through an influencer promotion can get their own welcome flow.
- Customers more likely to spend: When premium gift brand GourmetGiftBaskets.com stopped texting their full list and started using recency, frequency, and monetary (RFM) segments to reach the customers most likely to buy. In their first full month with RFM segmentation, SMS RPR rose 88% MoM.
Experiment with your SMS cadence, and use the results to refine your segments. To start, we recommend this monthly plan:
- Two major announcements: Send promotions, new releases, or holiday messages to your full list.
- Two follow-ups: Schedule follow-ups, either for early access or last call before the sale ends, excluding people who have already converted.
- 3 targeted campaigns: Send to segments such as VIPs, category or product purchasers or viewers, and new subscribers who haven't purchased yet.
Sending enterprise SMS campaigns, automations, and conversations
Each use case for text messaging, across both marketing and customer service, requires a different way of using the channel.
For example, according to Klaviyo’s 2026 Omnichannel Benchmark Report, 80% of text message campaign revenue came from repeat buyers vs. 20% new buyers, whereas 64% of revenue from flows came from new buyers.
That suggests that if your goal is retention, it makes sense to prioritise text message campaigns, but if you want to bring in new subscribers, you might focus on automated text messages like welcome series and abandonment flows.
Engage subscribers at meaningful moments with text message campaigns
Campaigns that play to the channel's strengths, speed and intimacy, tend to perform well, especially when you send them to a defined segment rather than the whole list.
Here are a few campaign types where text messages tend to perform well:
- Product launch promotions, like a new collection shown in an RCS carousel
- Early access to sales and discounts, with a 'Shop now' button that goes straight to the product
- VIP and loyalty programme messages, with links to exclusive content or early access to sales or product drops
Automate enterprise customer journeys with SMS flows
According to Klaviyo's 2026 SMS Marketing Benchmark Report, flows make up 7.6% of SMS sends but drive 45.2% of SMS revenue.
That’s because automations nurture customer relationships at scale. Set up the following core text message flows in Klaviyo:
- Welcome series
- Abandoned cart recovery
- Back in stock and price drop
- Post-purchase updates
- Win-back
- Review requests
- Replenishment reminders
- Cross- and up-sell
Support customers over text with two-way conversations
Unlike email, text messaging is a channel that sometimes invites responses from customers. They might text back to ask where their order is, how to start a return, whether a jacket runs small, or which product fits their needs.
Customer Agent, Klaviyo’s AI customer service agent, can answer those texts around the clock, drawing on each customer's order history and your product catalogue. When it can’t resolve an issue, it can escalate the conversation to a person with complete context preserved. What the customer shares, like their size or style, then feeds their profile for future personalisation.
Customer Agent can also start a conversation when it detects someone abandoning a cart. With this kind of invitation to chat, the customer gets the opportunity to explain what’s stopping them from purchasing, like a sizing question or shipping concern, get reassurances, and check out, all in the same conversation.
How to scale text message marketing as an enterprise brand
1. Use an AI marketing agent to draft content and identify opportunities for text message marketing
With an AI marketing agent like Composer, Klaviyo’s built-in AI marketing agent, you can:
- Surface opportunities where text message campaigns and flows can engage subscribers and customers and drive more revenue.
- Create marketing content based on your brand context, going from brief to text message campaigns to omnichannel flows.
- Generate segments and an overall strategy for text message marketing.
- Analyse and optimise your text message marketing efforts on a regular basis.
2. Coordinate text messages with your other channels
77% of global omnichannel consumers shop across 3–4 channels, and more than 20% use 5 or more, according to Klaviyo’s 2025 Online Shopping Report. No surprise, then, that text messages perform best as one part of a broader omnichannel marketing programme.
Running multiple channels on one platform like Klaviyo makes it easier to coordinate cross-channel campaigns and flows effectively, without over-messaging your subscribers. For example:
- A purchase may trigger an email receipt, a text message cross-sell a week later, and a WhatsApp loyalty offer at 30 days.
- If a customer ignores an email, the next message in the flow is automatically a text message.
- When a customer converts, exit rules can stop the rest of the sequence on every channel.
When drinkware brand Corkcicle started sending text messages through Klaviyo, they launched 9 multi-channel abandonment and win-back automations and saw 93% growth in revenue from flows between Q1 and Q2 2025, their first full quarter with Klaviyo SMS. Flows drove 56% of their Klaviyo-attributed revenue that quarter.
If you’re using an AI marketing agent like Composer to help create omnichannel flows, it can suggest the best channels for each message, as well as the timing between messages.
3. Use 1:1 personalisation to get your messages out on the right channel at the right time
Customers tend to respond on some channels and at some hours more than others, and those patterns change over time.
Klaviyo AI helps you keep up with changing preferences with 1:1 personalisation features like:
- Channel affinity, which uses each customer's historical and real-time behaviour to identify which channels they’re most likely to engage with next
- Personalised send time, which sends each campaign at the hour each recipient is most likely to open or click, across email, SMS, RCS, WhatsApp, and push
- AI-powered product recommendations, which update dynamically based on browsing or purchase history
When fruit-infused water brand Hint Water moved email and SMS onto Klaviyo, they started using channel affinity to suppress customers from email campaigns who are more likely to engage with SMS next, and vice versa. This reduces redundant sends for dual subscribers, and creates a more responsive, engaging customer experience.
In their first 3 months with Klaviyo SMS, that strategy helped boost email campaign engagement—click rate jumped 18% PoP, and RPR climbed 14%—and Hint saw 39x SMS return on investment (ROI).
4. Understand throughput and deliverability
SMS throughput is the number of messages a carrier can deliver within a specific timeframe. Different types of text messages have different throughputs. For example:
- SMS has a higher throughput than MMS, so use SMS for peak times, holidays, and messages that need immediate delivery, like those promoting flash sales, and save MMS for flows and smaller segments.
- With RCS, you can also send more messages in a shorter amount of time, because RCS is sent over data networks and therefore has much higher throughput.
SMS deliverability, meanwhile, is the percentage of your messages that reach subscribers’ phones. Wireless carriers filter messages before they arrive, based on a few factors:
- Sender type: Carriers tend to trust short codes, the 5- or 6-digit numbers brands lease for high-volume texting, more than other sender types, like long codes or toll-free numbers. Short codes are a good option for brands that want to avoid heavy filtering or want to send more than 30,000 messages at once.
- Content: Carriers screen for restricted topics under S.H.A.F.T. principles (sex, hate, alcohol, firearms, or tobacco), plus federally illegal substances.
- Audience signals: High opt-out or spam-report rates can lead carriers to filter or suspend your sending number.
To improve your SMS deliverability, follow carrier standards and regional regulations, and time your sends to each recipient’s location. Klaviyo’s SMS deliverability hub, which tracks message performance, can help you protect your sender reputation.
5. Follow enterprise SMS compliance essentials
Text message marketing laws require brands to obtain consent before sending, and under the US Telephone Consumer Protection Act (TCPA), damages are assessed per message. A single mis-mapped consent field can turn into thousands of violations when the campaign goes to a list of hundreds of thousands.
A text message marketing platform with compliance built in handles the checks that would be impossible to run by hand at that volume. Klaviyo, for example:
- Tracks marketing and transactional consent separately on every profile
- Holds or skip sends that land in a recipient’s local quiet hours
- Adds region-specific compliance and opt-out language to texts by default
- Screens out known litigators before they subscribe
- Spots delivery failures and unsubscribe spikes in the SMS deliverability hub
Keep someone on your team accountable for compliance, document your consent records, and make sure your legal team weighs in on what the TCPA, the EU General Data Protection Regulation (GDPR), and local rules require for your programme.
Measuring enterprise SMS marketing success and ROI
Once your text message programme is set up, track these topline metrics:
- Subscribe rate: the percentage of people who saw a text message sign-up form and opted in
- Click rate: the percentage of a message's recipients who clicked a link within
- Placed order rate: the percentage of a message’s recipients who placed an order within your attribution window
- RPR: revenue attributed to a message, divided by the number of people who received it
- ROI: revenue attributed to text messages, minus messaging and platform costs, divided by those costs
- Time to sale: the average time between a subscriber opting in and their first purchase
- Customer lifetime value: the total revenue you can expect from a customer over the full relationship
Klaviyo empowers you to benchmark your text message marketing performance against your other channels and against what’s typical in your industry. If it doesn't measure up, find out why before changing anything.
Composer, Klaviyo’s built-in AI marketing agent, can analyse your campaign and flow performance, explain what changed, and recommend fixes, like flagging flows where added text messages aren't driving enough revenue.
What to look for in an enterprise SMS marketing platform
What to evaluate | Questions to ask | How Klaviyo handles it |
Customer data | Can the platform bring your commerce, POS, support, and loyalty data onto one real-time profile without custom integration work? | 350+ pre-built integrations feed one real-time profile per customer on Klaviyo’s built-in customer data platform (CDP), and duplicate profiles merge automatically. |
Channel coordination | Do all your channels send from the same platform, with shared suppression rules and reporting? | Email, SMS, RCS, WhatsApp, push, and in-app messages all run in Klaviyo, so cross-channel suppression and exit rules prevent over-messaging, and you always know what each customer received. |
Consent and compliance tools | How does the platform collect, record, and enforce consent in each country you text? | Klaviyo tracks marketing and transactional consent separately, applies quiet hours and regional rules, screens out known litigators, and shows compliance health in real time. |
Scale and reliability | Can the platform handle your peak volume? | Text message volume on Klaviyo grew 34% YoY during BFCM 2025, and Klaviyo delivered more than 22.7 billion messages overall. Klaviyo also publishes live platform status year-round. |
Personalization | Can the platform choose the best content, channel, and send time for each individual person? | 1:1 AI personalization features make it easy to select the right channel, timing, and content for each individual, not just large segments of subscribers. |
AI agents | Can agentic AI help your team analyze performance, build campaigns, and support customers? | Composer analyzes performance and drafts campaigns, flows, and segments for your approval, while Customer Agent answers customer texts and hands off to your team when needed. |
Migration | Can you bring your full subscriber list over with consent records intact? | Klaviyo comes with a standard ecommerce data structure, so you don't have to design one before you migrate, and you can import anywhere from the past 30 days to your full order and engagement history. Helen of Troy migrated 3 major brands to Klaviyo in about a month. |
Enterprise SMS marketing FAQs
What is enterprise SMS marketing?
Enterprise SMS marketing is how large B2C brands run text message marketing across millions of subscribers, multiple countries, and sometimes multiple brands. Compared with a smaller programme, it requires stricter consent management, greater sending capacity at peak volume, and connected customer data to personalise messages at that scale.
How is enterprise SMS different from bulk texting?
Bulk texting sends the same message to an entire list. Enterprise text message marketing uses a combination of unified customer data, segmentation, flow logic, and agentic AI to decide who gets which message, when.
How much does enterprise SMS marketing cost?
Costs depend on message volume, message type (SMS, MMS, or RCS), the countries you send to, carrier fees, and the platform itself. If you're moving text message marketing onto the same platform as email, factor in what you'll save by cancelling separate tools. Grooming brand Dollar Shave Club cut total cost of ownership over 30% by consolidating CRM in Klaviyo.
Is SMS marketing legal for enterprise brands?
Yes, when subscribers opt in and you follow the rules where you send. In the US, that includes the TCPA and carrier requirements. In the EU, it means GDPR. Work with your legal team, and choose a platform that records consent by channel, holds sends during each recipient's quiet hours, and processes opt-out replies like STOP automatically.
How often should enterprise brands send SMS campaigns?
A good starting point is about 7 text messages a month: two major announcements, two follow-ups, and 3 targeted campaigns. Then, test your cadence and adjust by engagement.
What's a good click rate for SMS campaigns?
The average SMS campaign earns a 5.6% click rate, according to Klaviyo's 2026 SMS Marketing Benchmark Report, while click rates for the top 10% of campaigns reach 10.44%. Automated flows average a 9.65% click rate, with top performers at 16.6%.
Explore how Klaviyo B2C CRM powers enterprise text message marketing. Get a demo