How to leverage SMS marketing software to increase return visits

Speak in British English with a confident, authoritative, and conversational tone - like a senior consultant briefing a client. Measured pace, clear diction, professional but not stiff. Natural pauses for emphasis. Approximately 10 minutes total. Welcome to the Purple technical briefing series. Today we are talking about SMS marketing software - specifically, how venue operators can use it to drive measurable increases in return visits. Whether you run a hotel chain, a retail portfolio, a stadium, or a conference centre, the principles here apply directly to your operation. [pause] Let me start with the problem. Physical venues have a data gap. Thousands of guests walk through your doors every week, and most of them leave as strangers. You know they visited. You might know roughly when. But you have no verified, direct way to reach them afterwards. That is a significant commercial gap. SMS marketing software closes it - but only when you have the right data infrastructure underneath it. And that infrastructure starts at the WiFi login. [pause] Section one: why SMS outperforms every other re-engagement channel. The numbers are not subtle. SMS carries a 98% open rate. Email sits at around 20 to 28%. That is not a marginal difference - it is a structural one. When you send an SMS to a verified phone number, it gets read. Ninety percent of messages are read within three minutes of delivery. Click-through rates for well-segmented SMS campaigns run between 18 and 35%, depending on campaign type and timing. Conversion rates for programmes with solid segmentation land at 21 to 30%. Compare that to email's 10 to 15% and you understand why SMS deserves its own budget line, not just a footnote in your email strategy. ROI figures reinforce this. Industry data puts average SMS marketing returns at between 21 and 41 pounds for every pound spent. In well-optimised, behaviour-triggered programmes, that figure climbs higher. These are not theoretical projections. They are what venues running Purple Engage across our 80,000-plus live venues are seeing in practice. [pause] The critical word in all of this is "verified." This is where Guest WiFi becomes the foundation of your entire SMS strategy. When a visitor connects to your Guest WiFi through a captive portal - the branded login screen they see before they get internet access - you have a structured, consent-driven moment to capture their phone number. Not a guessed number from a third-party list. Not a purchased contact. A number they typed in themselves, verified by a one-time passcode, with explicit marketing consent recorded at the point of capture. Purple Engage captures that data across more than 80,000 live venues. In 2024 alone, we processed 440 million logins. Every one of those logins is a potential first-party data point - a verified identity attached to a real visit, a real location, and a real timestamp. That data architecture is what makes meaningful segmentation possible. And segmentation is what separates a 3% click-through rate from a 26% one. [pause] Section two: the technical architecture. The data flow has five stages. Stage one: the venue access point - whether that is Cisco Meraki, HPE Aruba, Ruckus, Juniper Mist, or Ubiquiti UniFi - routes unauthenticated devices to the captive portal. Stage two: the captive portal presents a branded login screen with a clear, GDPR-compliant consent checkbox. The visitor enters their phone number, receives a one-time passcode, and confirms. Stage three: Purple Engage stores that verified number alongside the visit metadata - venue, timestamp, dwell time, visit frequency. Stage four: the automated campaign engine applies your segmentation rules and triggers the appropriate SMS at the configured time. Stage five: the message lands on a verified device, with a tracked link that closes the attribution loop back to your analytics dashboard. Purple operates as a hardware-agnostic cloud overlay. You do not need to replace your existing network infrastructure. The platform sits on top of Cisco Meraki, HPE Aruba, Ruckus, Juniper Mist, Ubiquiti UniFi, Cambium, Extreme, and Fortinet hardware. The captive portal and campaign engine are delivered as a cloud service with 99.999% uptime. The compliance layer sits across all five stages. GDPR and PECR - the Privacy and Electronic Communications Regulations - require explicit, specific, freely given consent for SMS marketing. That consent must be separate from the WiFi access itself. You cannot make SMS opt-in a condition of connecting. Purple's captive portal handles this correctly by design. The opt-in checkbox is clearly labelled, separate from the connect button, and the consent record is timestamped and stored. Purple is ISO 27001 certified, GDPR and CCPA compliant, and B Corp certified. [pause] Section three: the four audience segments that drive return visits. Segment one: new visitors. First-time guests who connected to your WiFi in the last seven days. A welcome SMS with a small incentive for a return visit - say, 15% off - sent within 24 to 48 hours of their first visit, captures them while the experience is still fresh. Purple data shows a 28% second-visit rate from this segment when the follow-up is sent within that window. Segment two: lapsed visitors. People who visited your venue 30 or more days ago and have not returned. A targeted re-engagement SMS - something like "We have not seen you in a while. Here is 20% off your next visit" - sent at the right time, to the right person, consistently outperforms broadcast campaigns. The re-engagement rate for this segment runs at around 45% when the message is personalised to visit history. Segment three: frequent visitors. Your highest-value guests. These people visit regularly and respond well to loyalty messaging - early access, double points, exclusive offers. The goal here is not re-engagement; it is frequency amplification. Venues using this segment correctly see visit frequency increase by a factor of three compared to non-targeted guests. Segment four: event attendees. If someone attended a conference, a match, or a concert at your venue, they are a warm prospect for the next one. An SMS sent within 48 hours of their visit, referencing the specific event, with a link to the next event or an exclusive pre-sale, converts at rates significantly above standard promotional messages. [pause] Section four: two real-world implementation scenarios. Scenario one: a 250-room hotel. The property runs Purple Engage on an HPE Aruba network. Guests authenticate via SMS OTP at login. Over 12 months, the hotel builds a verified database of 18,000 unique guest phone numbers. They run three automated campaigns: a post-checkout follow-up with a return booking offer, a lapsed guest re-engagement at 60 days, and a seasonal promotion to guests who visited the same period last year. The result: a 31% increase in direct bookings from repeat guests, reducing OTA commission costs by an estimated 140,000 pounds annually. The SMS list became a direct revenue channel. Scenario two: a 12-site retail chain. Each site runs Purple on Cisco Meraki hardware. Shoppers who connect to Guest WiFi and opt in to SMS receive a post-visit message with a personalised offer based on dwell time in specific zones tracked via WiFi Analytics. Lapsed shoppers who have not visited in 30 days receive a re-engagement SMS with a time-limited discount. Across the estate, the chain sees a 19% uplift in repeat visit frequency and a 23% increase in average transaction value among SMS subscribers. [pause] Section five: implementation pitfalls and how to avoid them. The first mistake is treating SMS as a broadcast channel. Sending the same message to your entire contact list is the fastest way to drive up opt-outs and drive down return on investment. The ROI on SMS sits between 21 and 71 pounds for every pound spent - but that range assumes segmentation. A broadcast to an unsegmented list sits at the bottom of that range. A triggered, behavioural message to a well-defined segment sits at the top. The second mistake is poor timing. SMS messages sent within five minutes of a user action - a visit, a purchase, an event check-in - achieve click-through rates of up to 36%. Scheduled broadcasts to a full list achieve around 9%. The difference is context. Build your campaign triggers around visit events, not calendar slots. The third mistake is skipping the attribution step. If you are not tracking which SMS messages drove which return visits, you cannot optimise. Every link in your SMS should carry UTM parameters. Every return visit should be matched back to the originating campaign in your analytics dashboard. The fourth mistake is underinvesting in the consent capture moment. The captive portal is not just a login screen. It is the data acquisition layer for your entire SMS programme. A poorly designed portal with buried consent options produces a small, low-quality list. A well-designed portal with a clear value exchange produces a large, high-intent list. Venues typically see 15 to 25% of WiFi users opt in to SMS. A venue with 500 daily connections can build a list of 20,000 to 30,000 verified numbers within six months. [pause] Section six: rapid-fire questions. How quickly should you send the first SMS after a visit? Within 24 hours for new visitors. Within 48 hours for event attendees. For lapsed visitor re-engagement, timing is less critical than personalisation. What is the right message length? Under 160 characters for standard SMS. If you need more, use a link to a landing page. Long messages fragment across multiple SMS units and increase cost. Do you need a short code? For high-volume venue programmes, a dedicated short code or a verified sender ID gives you better deliverability and brand recognition. Long numbers work for low-volume testing but do not scale. What frequency is safe? No more than four to six promotional SMS messages per month per contact. Sixty-one per cent of SMS unsubscribes are caused by over-frequency. Set your frequency caps in the campaign engine before you launch, not after you have seen a spike in opt-outs. Can SMS campaigns work without a loyalty programme? Yes. The WiFi login is the opt-in mechanism. You do not need a loyalty app. Does SMS replace email? No. They work best together. Email for longer-form content and pre-arrival communications, SMS for time-sensitive triggers. Adding SMS to an email programme produces roughly 56% higher ROI than email alone, according to industry benchmarks. [pause] Summary and next steps. SMS marketing software is the highest-ROI re-engagement channel available to physical venues - but only when built on verified, consent-compliant first-party data. Purple Engage captures that data at the WiFi login, automates the campaign triggers, and integrates with your existing CRM stack. The five actions to take this quarter: first, audit your current captive portal - is it capturing phone numbers with explicit marketing consent? Second, segment your existing contact list into the four groups - new, lapsed, frequent, and event. Third, set up at least one automated trigger - the 24-hour new visitor welcome message. It is the highest return on investment campaign in the toolkit and takes under an hour to configure in Purple Engage. Fourth, implement UTM tracking on every SMS link. Fifth, set your frequency caps before you launch. The full technical guide is available at purple.ai, including architecture diagrams, worked examples for hospitality, retail, and stadium environments, and the compliance checklist. Thanks for listening.