SMS Marketing for E-Commerce: Getting Started with Text Message Campaigns

Why SMS Marketing Works for E-Commerce

SMS messages have a 98% open rate and most are read within three minutes of delivery. Compare that to email's 20-25% open rate and it is clear why SMS has become a critical channel for e-commerce stores.

But SMS is a double-edged sword. Done well, it drives immediate sales with incredible efficiency. Done poorly, it annoys customers and damages your brand. The difference comes down to frequency, relevance, and consent.

SMS vs. Email: Different Tools for Different Jobs

SMS and email are not interchangeable. Each excels at different things:

SMS is best for:

Time-sensitive offers (flash sales, limited inventory alerts)
Abandoned cart recovery (complement to email sequence)
Order updates and shipping notifications
Short, action-oriented messages

Email is best for:

Detailed content (product stories, brand narratives)
Visual campaigns (product launches, lookbooks)
Long-form educational content
Complex promotions with multiple products

The most effective approach uses both channels together, with SMS for urgency and email for depth.

Compliance Is Non-Negotiable

SMS marketing is heavily regulated. Violating these rules results in massive fines and legal action.

TCPA (Telephone Consumer Protection Act)

Explicit consent required. You must have written permission before sending any marketing text.
Clear opt-in language. The customer must know they are agreeing to receive marketing texts.
Easy opt-out. Every message must include instructions to unsubscribe (typically "Reply STOP to opt out").
Penalties: Up to $1,500 per unsolicited text message sent.

Best Practices for Compliance

Use a separate opt-in for SMS (do not bundle it with email consent)
Keep records of when and how each subscriber opted in
Honor opt-outs immediately and automatically
Include your business name in every message so recipients know who is texting
Never send texts between 9 PM and 9 AM in the recipient's time zone

Building Your SMS Subscriber List

Website Pop-Ups

Add a phone number field to your existing pop-ups or create a dedicated SMS opt-in:

"Get exclusive text-only deals. Enter your phone number for 15% off your first order."

Make it clear they are signing up for texts, not just providing a phone number for order updates.

Checkout Opt-In

Add a checkbox during checkout: "Send me exclusive deals and updates via text message." This captures customers at the point of purchase when trust is highest.

Keyword Campaigns

"Text SAVE to 55555 for 15% off your first order." Promote this keyword on your website, social media, packaging inserts, and ads. Keyword campaigns convert well because the customer initiates the interaction.

Cross-Promote from Email

Send an email to your list promoting SMS-exclusive benefits: "Join our text club for deals we only share via text. Reply with your number or text JOIN to [number]."

Essential SMS Campaigns

Welcome Text

Sent immediately after opt-in. Keep it under 160 characters:

"Welcome to [Store]! Here is your 15% off code: WELCOME15. Shop now: [link]. Reply STOP to opt out."

Abandoned Cart Recovery

Send 30 minutes after cart abandonment (before your first cart recovery email):

"Hey [Name], you left [Product] in your cart! Complete your order before it sells out: [link]. Reply STOP to opt out."

SMS cart recovery converts 2-3x higher than email alone because the message is seen almost immediately.

Flash Sale Announcements

SMS is perfect for time-sensitive promotions:

"24-HOUR FLASH SALE: 25% off everything at [Store]. Use code FLASH25 at checkout: [link]. Ends midnight. Reply STOP to opt out."

Back-in-Stock Alerts

For popular products that sell out:

"Great news! [Product] is back in stock. Get yours before it sells out again: [link]. Reply STOP to opt out."

Shipping Updates

Transactional texts keep customers informed and reduce support requests:

"Your [Store] order has shipped! Track it here: [link]. Estimated delivery: [date]."

These are transactional, not marketing, but they keep your brand top-of-mind and build trust.

SMS Frequency and Timing

How Often to Text

The golden rule of SMS marketing is less is more:

Maximum 4-6 texts per month for marketing messages
Ideal frequency: 2-4 per month
Every text must provide clear value (a deal, important update, or exclusive access)

Unlike email, where subscribers tolerate higher frequency, even one irrelevant text can trigger an unsubscribe.

Best Times to Send

Weekdays: 10 AM - 12 PM and 5 PM - 7 PM
Weekends: 10 AM - 12 PM
Never: Before 9 AM or after 9 PM in the recipient's time zone
Day of week: Thursday and Friday perform best for weekend sale promotions

Choosing an SMS Platform

For Beginners

Postscript integrates with most e-commerce platforms and offers a straightforward setup with compliance built in. Pricing starts around $25/month plus per-message costs.

SMSBump (by Yotpo) offers strong segmentation and automation features with e-commerce-specific workflows.

For Stores Already Using Email Platforms

Klaviyo includes SMS as part of its platform, allowing you to manage email and SMS from one place with unified customer profiles. This is the simplest option if you already use Klaviyo for email.

Omnisend also offers combined email and SMS with pre-built automation workflows.

Cost Considerations

SMS costs more per message than email:

Per-message cost: $0.01-0.03 per text in the US
Monthly platform fee: $25-100 depending on features
1,000 subscribers at 4 texts/month: ~$40-120/month in message costs

Despite the higher cost, SMS revenue per message typically exceeds email by 3-5x, making the ROI favorable.

SMS and Email Working Together

Abandoned Cart Example

30 minutes: SMS reminder (catches them while the intent is fresh)
1 hour: Email 1 with product image and cart link
24 hours: Email 2 with social proof
48 hours: Email 3 with discount code
72 hours: Final SMS with the discount code

This combined approach recovers 20-30% more carts than email alone.

Product Launch Example

Day -3: Email teaser with full details and imagery
Day -1: SMS early-access link for text subscribers
Launch day: Email to full list plus SMS reminder to text subscribers

Giving SMS subscribers first access incentivizes list growth and rewards your most engaged audience.

Common SMS Mistakes

Texting too often. More than 6 texts per month and unsubscribe rates spike dramatically.
Generic messages. "Check out our store!" provides zero value. Every text needs a specific reason.
No personalization. Using the customer's name and referencing their purchase history improves conversion 2x.
Forgetting compliance elements. Every marketing text must include opt-out instructions and your business name.
Treating SMS like email. Long messages, multiple links, and detailed descriptions do not work in SMS. Keep it short and focused.

Key Takeaways

SMS has 98% open rates making it the most immediate channel available
Compliance is critical so always get explicit consent and include opt-out instructions
Send 2-4 marketing texts per month maximum because every message must provide clear value
Combine SMS with email for abandoned cart recovery and product launches to maximize results
Keep messages under 160 characters and focus on a single call to action
SMS costs more per message than email but generates 3-5x more revenue per message