How to leverage SMS service marketing to increase return visits

Speak in British English with a clear, confident, authoritative male voice - a senior consultant briefing a client. Measured pace, warm but direct, with natural pauses between sections. Professional and knowledgeable, not a lecturer: Welcome to the Purple technical briefing series. Today we are talking about SMS service marketing - specifically, how venue operators can use it to drive measurable return visits. Whether you run a hotel group, a retail estate, or a stadium, the core challenge is the same: you get a visitor through the door, but you have no reliable way to bring them back. SMS changes that. [short pause] Let me set the scene with a number. SMS messages carry a 98% open rate, according to Forbes and Infobip's 2026 messaging trends data. Email sits at around 21%. That is not a marginal difference. That is a different channel category entirely. And when you combine that reach with verified first-party data captured at your Guest WiFi login, you have something genuinely valuable: a direct line to a real person who has already visited your venue and consented to hear from you. [short pause] So let us get into the technical architecture. The foundation of any SMS service marketing programme is data capture at the point of WiFi authentication. When a guest connects to your Guest WiFi through a captive portal, Purple Engage captures their verified phone number alongside their email address, visit timestamp, and location data. That data is tied to a real device, a real visit, and - critically - explicit consent. This is not scraped data or purchased lists. It is first-party data, collected in compliance with GDPR and CCPA. [short pause] The captive portal is where consent is formalised. Under GDPR Article 7, consent must be freely given, specific, informed, and unambiguous. Your splash page must present the SMS opt-in as a separate, unticked checkbox - not bundled with the WiFi terms of service. Purple's Engage plan handles this with configurable consent flows that log the timestamp, IP address, and consent version for every opt-in. That audit trail matters when a regulator asks questions. [short pause] Once you have a verified, opted-in phone number, the automation layer takes over. Purple Engage connects to your SMS gateway - whether that is Twilio, MessageBird, or a similar provider - via webhook or direct API integration. You configure trigger rules based on visit behaviour: first visit, return visit within 30 days, lapsed visitor after 60 days, or high-frequency visitor who qualifies for a loyalty tier. Each trigger fires an automated SMS with a personalised message, a redemption code, and a clear opt-out instruction. [short pause] The message itself matters enormously. SMS has a 160-character limit per segment. Every word must earn its place. The highest-performing messages follow a simple structure: personalisation, offer, urgency, and opt-out. Something like: "Hi Sarah, thanks for visiting us last week. Your 20% discount expires Sunday. Show this at checkout. Reply STOP to opt out." That is 97 characters. Direct, compliant, and actionable. [short pause] Now let me walk you through two real-world implementation scenarios. The first is a 200-room hotel group. They deployed Purple Engage across four properties on Cisco Meraki hardware. At WiFi login, guests provided their phone number and opted into SMS updates. Purple segmented those guests by stay frequency: first-time visitors received a post-stay thank-you message with a direct booking discount 48 hours after checkout. Repeat guests received an early-access rate for their next stay, triggered 21 days after their last visit. The result: a 31% increase in direct bookings from opted-in guests compared to the anonymous traffic baseline. That figure comes from Purple's own platform data across hospitality deployments. [short pause] The second scenario is a retail shopping centre with 85 tenants. The centre operator used Purple Engage to build a unified guest database across all WiFi access points - deployed on HPE Aruba infrastructure. Shoppers who connected to the centre WiFi and opted in received SMS messages tied to their visit patterns. Frequent visitors received early access to sale events. Infrequent visitors received re-engagement messages after 45 days of absence. The centre reported a 23% uplift in return visit frequency among opted-in shoppers within the first 90 days of the programme. Attribution was tracked by matching WiFi reconnection events to the SMS campaign send timestamps in the Purple analytics dashboard. [short pause] Let us talk about segmentation, because this is where most operators underinvest. A single SMS blast to your entire opted-in list is not SMS service marketing. It is spam with better delivery rates. Effective segmentation uses at least three dimensions: recency, which is how recently the guest visited; frequency, which is how often they visit; and behaviour, which is what they did during their visit - dwell time, zones visited, or purchase category if you have POS integration. Purple's WiFi Analytics platform surfaces these dimensions natively. You can build audience segments directly in the dashboard and push them to your SMS automation flows without exporting CSV files or involving a developer. That operational simplicity is what makes the difference between a programme that runs consistently and one that gets abandoned after the first campaign. [short pause] Now for implementation pitfalls. The three most common failures we see are: opt-in rates that are too low because the consent form is buried; message frequency that is too high, which drives opt-outs above 3.5% per send; and attribution gaps where operators cannot connect SMS sends to actual return visits. On opt-in rates: the splash page design matters. A/B testing by Purple's customer success team shows that placing the SMS opt-in above the fold, with a clear value proposition - "Get exclusive offers by text" - increases opt-in rates by up to 40% compared to a generic checkbox at the bottom of a form. On frequency: the data from Sakari and Infobip consistently shows that 49% of subscribers prefer messages no more than once a fortnight. Exceeding that without a clear value exchange accelerates opt-outs. Set a maximum send frequency rule in your automation platform and enforce it at the segment level. On attribution: use unique redemption codes per campaign, not generic discount codes. A unique code lets you trace every return visit back to a specific SMS send, a specific segment, and a specific message variant. Without that, you are guessing at ROI. [short pause] Now, rapid-fire questions from the briefing room. Question: Do we need a dedicated short code or can we use a long number? Answer: For high-volume venue programmes, a dedicated short code gives you better deliverability and brand recognition. For smaller deployments under 500 messages per month, a long number or alphanumeric sender ID works fine and costs less. Question: How do we handle guests who opt out? Answer: Purple Engage automatically suppresses opted-out numbers from all future sends. The opt-out is logged with a timestamp and synced to your CRM. You cannot legally re-add them without fresh explicit consent. Question: Can we integrate SMS with our existing CRM? Answer: Yes. Purple Engage connects to Salesforce, HubSpot, and most major CRM platforms via REST API or Zapier. Phone numbers and consent records sync in real time. [short pause] To summarise the key points from today's briefing. SMS service marketing delivers a 98% open rate versus 21% for email - that gap justifies the investment on its own. The data foundation is your Guest WiFi login: Purple Engage captures verified, consented phone numbers at the point of connection. GDPR compliance requires a separate, explicit SMS opt-in - not bundled with WiFi terms. Segment by recency, frequency, and behaviour before you send a single message. Keep messages under 160 characters, include a clear offer, and always include an opt-out instruction. Use unique redemption codes for every campaign to close the attribution loop. And cap your send frequency at once a fortnight unless you have a compelling reason to go higher. [short pause] Your next steps: audit your current captive portal to check whether your SMS opt-in is visible and compliant. If you are not yet capturing phone numbers at WiFi login, that is the first thing to fix. Then map your guest segments - first visit, returning, lapsed - and build one automated flow for each. Start with the lapsed visitor re-engagement flow. It has the highest ROI because those guests already know you. For more detail on the technical architecture, visit purple.ai and explore the Engage plan documentation. You can also find related guides on Guest WiFi data capture and WiFi Analytics on the Purple website. Thanks for listening. We will see you in the next briefing.