Text messages get opened and read far faster than almost any other channel, which makes SMS one of the most effective ways to get customers talking about your referral program. But texting customers isn’t as simple as firing off a promo blast — there are consent rules, character limits, and timing considerations that can make or break a campaign.
This guide walks through exactly how to promote a referral program over SMS: who you can legally text, how to write a message that drives action, when to send it, and the mistakes that get businesses blocked or flagged as spam.
Quick Answer
To promote a referral program via text, get documented opt-in consent first, then send a short, personal-sounding message that states the reward, includes the referral link, and gives an easy way to opt out. Keep it under 160 characters when possible, send it through a registered business SMS platform (not a personal phone), and follow up with a reminder a week or two later for anyone who hasn’t shared yet.
Step 1: Get Consent Before You Text Anyone
In the US, the Telephone Consumer Protection Act (TCPA) requires prior express written consent before you send marketing or promotional texts to someone’s mobile number. A customer giving you their phone number at checkout to get a shipping update is not the same as consent to receive marketing texts — those need to be collected separately, usually through a checkbox or opt-in keyword at signup, checkout, or in your app.
If you’re sending from a US business number, you’ll also need to register your messaging campaign under the A2P 10DLC system through your SMS provider (Twilio, SimpleTexting, EZ Texting, Attentive, and similar platforms all handle this registration for you). Carriers now block unregistered bulk business texting outright, so skipping this step means your messages may never arrive at all.
Keep a record of when and how each contact opted in — it’s your protection if a complaint or audit ever comes up, and most SMS platforms log this automatically.
Step 2: Write a Message That Actually Gets Shared
The best referral texts read like something a friend would send, not a corporate blast. Lead with the reward, keep it specific, and include the referral link right away — don’t make people hunt for it. A solid structure: a friendly opener, the offer (what the referrer and the friend each get), the link, and an opt-out line.
Example: “Hey [Name]! Know someone who’d love [Brand]? Share your link and you both get $10 off: [link]. Reply STOP to opt out.” Keep the whole thing under 160 characters when you can — that’s the limit for a single standard SMS segment before carriers split it into multiple messages, which can look sloppy and cost more to send.
Personalization matters more in SMS than almost any other channel. Use the recipient’s first name, reference their recent purchase or signup if your platform supports merge fields, and avoid anything that reads like a mass blast with excessive emojis, all-caps, or exclamation points — that’s a fast way to get flagged as spam by carrier filters.
Step 3: Time It and Follow Up
Send the first referral invite shortly after a positive moment — right after a purchase, a good support interaction, or a milestone in your product (first successful use, a completed project, etc.). Customers are most willing to refer when they’re happy, not weeks later when the experience has faded.
A single reminder text 7-14 days later to people who haven’t shared yet can meaningfully lift participation, but don’t go beyond that. Repeated referral texts to the same person in a short window are one of the fastest ways to trigger opt-outs and spam complaints, so most SMS platforms let you cap how many promotional texts a contact receives per month — use that setting.
Segment your list if you can: customers who already referred someone can get a different message (maybe a thank-you plus a double reward), rather than the generic first-ask text.
Tips / Common Mistakes
Don’t text from a personal cell number for a business campaign — unregistered numbers get throttled or blocked by carriers, and it looks unprofessional. Use a dedicated SMS marketing platform with proper 10DLC or toll-free registration.
Don’t bury the opt-out. Every promotional text needs a clear way to stop receiving them (typically “Reply STOP”), and your platform should handle that automatically — don’t try to manage opt-outs manually.
Don’t send the referral link without context. A bare link with no explanation of the reward looks like spam and gets ignored or reported.
Don’t over-text. One well-timed invite plus a single follow-up beats a weekly nudge that trains people to ignore or block your number.
Don’t skip the HELP keyword setup — carriers and most SMS platforms require a working “Reply HELP” response as part of compliant campaign registration.
Explore more: More referral program basics.
SMS referral program promotion FAQs
Do I need special permission to text customers about my referral program?
Yes. Under the TCPA, you need documented prior consent to send marketing texts, and your business number typically needs to be registered through the A2P 10DLC system with your SMS provider before sending bulk promotional messages in the US.
What’s the ideal length for a referral program text?
Aim for under 160 characters so the message sends as a single SMS segment. Lead with the offer, include the link, and end with an opt-out line.
How often should I text customers about referrals?
A good rule of thumb is one initial invite plus one reminder a week or two later for non-responders. Sending more than that tends to increase opt-outs rather than referrals.
Can I use a personal phone to send referral texts to customers?
It’s not recommended for any volume beyond a handful of messages. Business texting should go through a registered SMS platform so messages aren’t blocked by carrier spam filters and so opt-outs, STOP, and HELP replies are handled automatically.
Turn Customers Into Your Growth Engine
Launch a referral program that turns happy customers into your best growth channel — with ReferralEarl. Try ReferralEarl.
Want this in your inbox? Subscribe to the free newsletter.
Photo by NordWood Themes on Unsplash.
