People tend to guard their phone numbers a little more closely than their email addresses. That’s why collecting SMS opt-ins can feel like trying to get invited to an exclusive group chat. You have to earn subscribers’ trust, make the value clear, and remove as much friction as possible.
Then, there’s the not-so-glamorous part: compliance and all its confusing legal rules. But don’t let the red tape scare you off. When done right, it’s easily worth the effort, giving you an instant, direct line to your absolute best customers.
So, how do you collect SMS opt-ins without annoying potential customers or running afoul of compliance rules? This guide covers the most effective opt-in methods and best practices, so you can grow your SMS list with confidence.
Understanding SMS opt-ins
An SMS opt-in is a customer giving you permission to text them. You can collect that permission in several ways, from website forms and checkout pages to text-to-join campaigns and in-person interactions.
Think of it as the first step in building a trusted SMS subscriber relationship. You get a direct line to interested customers, and subscribers get special deals, early access, or VIP perks sent straight to their phones.
It’s not optional, either. Without express written consent, you cannot send marketing messages by text to anyone, not even your most loyal, long-term customers.
SMS compliance rules you need to know
There’s no way around it. If you want to text your customers, you have to abide by SMS compliance laws, like the Telephone Consumer Protection Act (TCPA). These laws vary by region, but most marketers will run into the same core requirements:
- Register your brand: Before you can send marketing texts at scale, you need to register your brand with carriers. It’s a one-time setup that tells carriers you’re legit and keeps your promotional SMS messages from getting filtered as spam.
- Obtain explicit consent: You need explicit written consent before sending marketing text messages. Consent should be clear and intentional, not hidden in fine print or collected through pre-checked boxes.
- Set clear expectations: No surprises allowed. To stay compliant, your opt-in form must clearly show your business name, message frequency, standard data rate warnings, and a link to your terms and privacy policy.
- Make opt-out easy: Every message needs to clearly explain how to opt out. “Text STOP to unsubscribe” is the industry standard, and when someone sends an opt-out text message, you must remove them from your list without delay.
- Keep good records: If there’s ever a dispute, it’s on you to prove the customer opted in. Make sure your platform automatically saves a digital paper trail, including the form used and its text disclosure. Keep it for at least 4 years.
Single opt-in vs. double opt-in
Not all SMS opt-ins work the same way. Most businesses collect consent through either a single opt-in or double opt-in process.
With single opt-in, a subscriber joins your list in 1 step. As soon as they share their phone number and provide consent, they’re on your list. It’s fast and frictionless, but it leaves the door open for typos, fake numbers, and accidental signups.
The double opt-in method adds a quick confirmation step, where the subscriber receives an automated text asking them to confirm their signup, usually by replying YES or clicking a link. It’s a tiny bit more effort from your subscriber, but the payoff is a list full of people who genuinely want to hear from you.
Popular SMS opt-in methods
Don’t make people come to you. If you want to increase SMS opt-ins, you need to meet potential subscribers where they’re already spending time, both online and offline. Here are some ideas to help you get started.
Put SMS signup forms on your website
Your website is your home base. Every visitor is a potential SMS subscriber, and the best part is that they’re already curious about what you offer. You just have to give them a reason to sign up and put the opportunity in front of them.
Start by adding these SMS signup forms:
- Website pop-ups: Use a scroll-triggered or time-delayed pop-up to ask for opt-ins after visitors have spent some time on your site. When paired with a discount, exit-intent pop-ups work especially well, ensuring subscribers don’t leave empty-handed.
- Embedded web forms: Add an opt-in form to your sidebar, footer, or right in the middle of your blog content to catch visitors who prefer a quieter, less intrusive signup experience. These forms are always visible without interrupting the browsing flow.
- Landing pages: Create a dedicated landing page focused entirely on SMS signups. Strip away the navigation menus and external links so the only thing visitors can do is read your offer and submit their number.
For the best results, consider using a signup form template to launch faster, stay on brand, and simplify compliance. Then, test your opt-in forms on mobile before you go live. Most of your visitors are on their phones. If the form is hard to read or clunky to fill out, there’s little to no chance they’ll bother.
Collect SMS opt-ins during checkout
The checkout page is your ultimate high-intent zone. Customers are already actively buying from you, which means brand trust is at its peak. You need to capture that momentum before they complete their purchase.
To do that, start with these checkout opt-in opportunities:
- Online checkout: Add an optional SMS consent checkbox during the checkout process. Keep it unchecked by default and pair it with a clear, single-line description of what they’re signing up for, like “Get shipping updates and exclusive deals sent straight to your phone.”
- Account creation: Invite customers to join your SMS subscriber list when they create an account. They’re already filling out a form, and in a yes mindset, so 1 more field asking for their phone number is barely a speed bump.
- Post-purchase pages: Put a quick SMS opt-in message on the thank-you page. Sweeten the deal by promising customers an easy way to track their orders, plus exclusive deals and perks they won’t find anywhere else.
Don’t hide the compliance language. Keep the opt-in checkbox copy clear and benefit-focused, but make sure important disclosures are easy to find. A Terms apply link helps provide additional details without cluttering the signup experience.
Use email marketing to grow your SMS list
You’ve already done the hard work of building an email list. Your existing email subscribers like your brand and trust you enough to let you into their inbox. Why not give them a faster, more direct way to hear from you?
You can promote your SMS program to your email subscribers with:
- Dedicated campaigns: Craft a focused, single-purpose email asking subscribers to join your SMS marketing list. Use eye-catching visuals, lead with the benefits of joining, and make the signup link impossible to miss.
- Newsletter promotions: Sneak an SMS opt-in mention into your existing email newsletters. A short callout, a banner, or even a PS line at the bottom nudges engaged readers to take the next step.
- Email footer opt-ins: Add a persistent signup link to the bottom of every email you send. It’s low effort to set up and quietly collects phone numbers from people who are ready to sign up on their own terms.
For an instant win, segment your email list and target your most engaged subscribers first. People who open and click your emails regularly are your biggest fans. And they’re the most likely to opt in and respond positively to your SMS marketing campaigns as well.
Promote SMS signups on social media
Your social media followers probably already have their phones in their hands. As they’re scrolling, tapping, and liking, they’re only a click away from joining your SMS list. Just put the invitation in the right spot, and they’ll naturally gravitate toward it.
Try these tactics to attract new SMS subscribers on social media:
- A link in your bio: Point your Instagram, TikTok, or Linktree bio link straight to your SMS landing page. Change the link text to something enticing like “Get 15% off via text” or “Join to get VIP text messages.”
- Engaging stories and reels: Use the Add link sticker and tease a text-only discount code. Create urgency with a message like, “This code is only available to our text subscribers for a limited time. Grab it now!”
- Paid campaigns: Run retargeting ads to website visitors who didn’t convert. Design a carousel with all the benefits of joining your SMS marketing program, ending with a flash sale offer that’s only available via SMS.
Design text-to-join SMS campaigns specifically for each social media platform. Use a unique keyword for each one, like “Text IGDEALS” for Instagram, “Text FBDEALS” for Facebook, and “Text TTDEALS” for TikTok, so you can track exactly which platform drives the most signups.
Collect SMS opt-ins at in-person events
Trade shows, conferences, pop-up shops, and community events create a rare opportunity to connect with customers face-to-face. When people are already engaged with your brand in person, asking them to join your SMS list feels like a warm invite, not a cold pitch.
Asking in person is a great start, but you’ll also want to provide:
- Tablets: Have an iPad or tablet pre-loaded with your opt-in form. Attendees can subscribe in seconds by entering their phone numbers and hitting Subscribe, while you stand by ready to answer questions.
- Paper forms: Offer a printed signup for attendees who prefer old-school pen and paper. Make sure the form includes clear consent language and that you’re logging those numbers into your system quickly.
- QR codes: Slap a QR code on your table display, banner, or handouts and let people opt in from their own phones. They just have to snap a photo and fill out the form right there or save the link for later.
There’s nothing quite like a giveaway to encourage customers to hand over their phone numbers. Offer a prize that’s relevant to your audience, like a free product, a gift basket, or a VIP experience, and make SMS signup the entry requirement.
Invite loyalty members to join your SMS list
Your loyalty program members are your most valuable customers. They signed up, shop often to earn points, and consistently show they want more from your brand. They’re your warmest audience by far, making it easy to collect consent for your SMS campaigns.
You can engage these VIP customers by embedding your opt-in options directly into their member experience:
- Account registration forms: Include an optional, unchecked SMS signup field during the initial loyalty program account creation process. To drum up interest, offer a small bonus, like 50 points for adding their phone number.
- Loyalty portal dashboards: Add a quick opt-in prompt inside your loyalty program dashboard or member portal. A simple callout like “Get double points alerts and exclusive SMS deals” with a signup button lets members join in an instant while they’re already checking their rewards.
- Milestone notification emails: Send an email with an SMS opt-in link when a member reaches a new tier, earns a reward, or hits a points milestone. Frame it as the ultimate VIP upgrade: “You’re already a loyalty member. Now get your rewards even faster with text alerts.”
Use your loyalty program data to personalize SMS offers. If you know your customer’s birthday, their favorite product category, or their purchase history, use that to send targeted, relevant texts, for example, “We bet you’ll love our new cold brew concentrate. Here’s 15% off to try it” for coffee aficionados.
Add QR codes to product packaging or inserts
Product packaging is one of the most underutilized marketing assets in ecommerce. By packing a signup opportunity directly on your packaging, you reach the customer at the peak moment of excitement: the unboxing experience.
Capitalize on that post-purchase enthusiasm with these strategic placements:
- Package inserts: Include a small insert card inside every shipment that says something like “Scan to join our VIP text club and get 20% off your next order.” Use a simple design with a bold headline, a QR code, and a strong offer to grab attention and drive action.
- Product tags and labels: If you sell clothing, accessories, or any product with hangtags, add a QR code right on the tag. For beauty or food products, consider adding your code directly to the label itself.
- Shipping boxes: Print a QR code on the outside of all your shipping boxes. Not only does it catch customers the moment their package arrives, but it also turns every box into a mobile billboard.
Use dynamic QR codes so you can track scans and swap out the offer without reprinting new inserts, package labels, tags, or shipping boxes. This also lets you test different incentives and see which offers get the most signups.
How to create a subscriber-friendly experience
Staying compliant is important, of course, but you also want to make people feel good about signing up for promotional messages from your brand. Otherwise, even a perfectly compliant opt-in can leave a bad first impression, leading directly to an opt-out.
Set clear expectations
The fastest way to lose a subscriber is to fail to deliver on a promise you made at signup. For instance, if people sign up expecting occasional limited-time offers and suddenly start receiving marketing messages twice a day, they’re going to unsubscribe fast. Be sure to tell people up front what kind of messages you’ll send, how often, and what they’ll get in return. Then, stick to it.
Keep the opt-in process simple
Every extra field in your signup form is a reason for potential SMS subscribers to bail. More data is always nice, but not if it means losing the subscriber before they ever hit Submit. To avoid that, stick to the essentials. A name and phone number are all you need to get started. After that, you can collect data over time through their purchase history, preferences, and engagement patterns.
Include required compliance language
Compliance language isn’t optional, but it doesn’t need to be a wall of tiny gray text either. To avoid that, create a simple statement with your brand name, message types, frequency, and links to your terms and privacy policy. Then, write it up next to your signup form using a clean, simple font like Arial or Helvetica in a high-contrast color.
Offer an easy opt-out option
It might sound counterintuitive, but making it simple for subscribers to leave actually makes them more likely to stick around. When people know they can opt out any time with zero friction, they feel safer about opting in. Include your opt-out instructions at the point of signup and in every message you send after that.
Start building your SMS subscriber list
When growing your SMS list, you’re not trying to collect as many phone numbers as possible. Instead, the goal is to earn a place in your customers’ text message inboxes. That can only happen if you show up in all the right places, with clear value, a frictionless signup experience, and compliance built into every step of the process. Everything else, from the campaigns to your revenue, flows from there.