How to leverage bulk SMS for marketing to increase return visits

Right, let's get straight into it. If you run a venue - a hotel, a retail chain, a stadium, a conference centre - you already know that getting someone through the door the first time is expensive. Getting them back is where the money actually is. Today we're talking about bulk SMS for marketing. Specifically, how to build a pipeline that turns a guest WiFi login into a verified, consented phone number, and then turns that phone number into a return visit. This isn't about blasting your entire database with a discount code and hoping for the best. That approach is dead. What we're covering today is the architecture behind a properly segmented, GDPR-compliant bulk SMS programme that drives measurable footfall back to your venues. I'm going to walk you through the data capture layer, the segmentation logic, the campaign architecture, the compliance framework, and then we'll look at two real-world scenarios - one in hospitality, one in retail - where this has been deployed at scale. Let's go. [medium pause] So, the first thing to understand is why SMS outperforms every other re-engagement channel for physical venues. SMS messages achieve a 98% open rate, according to the Mobile Marketing Association. Email sits at 20 to 28%. That gap is not marginal - it is structural. SMS lands in a personal, high-attention space. The phone is in someone's pocket. The notification fires. They read it within three minutes, 81% of the time. Click-through rates for well-targeted SMS campaigns run between 19% and 36%. Conversion rates for segmented programmes reach 21 to 30%. And the ROI figure that keeps coming up in industry data is 71 pounds returned for every pound spent. That is the channel you want to be on. [short pause] Now, the critical question for venue operators is: where does the phone number come from? This is where Guest WiFi becomes your most valuable data asset. When a guest connects to your WiFi through a captive portal - that branded login page they see before they get online - you have a moment to capture a verified phone number alongside explicit marketing consent. Not a scraped number, not a purchased list. A number that person typed in themselves, on your premises, in exchange for connectivity. That is first-party data in the purest sense. Purple Engage, which sits on top of the Guest WiFi infrastructure at over 80,000 venues worldwide, automates this capture. The captive portal is configured to request name, phone number, and a clearly worded marketing consent checkbox. The consent is stored with a timestamp, the IP address, and the exact consent language shown - all of which you need under GDPR Article 7 to demonstrate valid consent. [short pause] Now, here is where most operators go wrong. They capture the number, they dump it into a flat list, and they send the same message to everyone. That is bulk SMS in the worst sense of the term. What you want is bulk SMS with intelligence behind it. The segmentation layer is what separates a 12% return visit rate from a 34% return visit rate. Purple Engage segments your audience automatically based on visit frequency, recency, and behavioural signals captured through the WiFi network. You end up with four primary cohorts. First: first-time visitors. These people connected once, they have not been back. They get a welcome series - three messages over 14 days. The first message fires 48 hours after their visit. It is warm, it references the venue, it includes a light incentive to return within 30 days. Second: lapsed guests - people who have not visited in 90 days or more. This is your win-back segment. They get a single high-value offer. Something with a deadline. Your 15% discount expires Sunday. Urgency converts. Third: frequent visitors. These are your advocates. They do not need a discount - they need recognition. Early access to an event, a VIP offer, a loyalty reward. This segment has the highest lifetime value and the lowest cost to retain. Fourth: high-value visitors. Identified through spend data or visit patterns. They get exclusive invitations - a private event, a new product launch, something that feels personal rather than broadcast. Now, the technical architecture underneath this. Purple Engage connects to your SMS gateway via a REST API. The gateway handles the actual message delivery - routing through mobile network operators, managing delivery receipts, handling opt-outs in real time. When someone replies STOP, that number is suppressed immediately across all future sends. That suppression has to be instantaneous under GDPR and the UK's Privacy and Electronic Communications Regulations, known as PECR. The message itself needs to stay under 160 characters for a single SMS credit. Go over that and you are into concatenated messages - two credits, higher cost, slightly lower deliverability. Keep it tight. A name merge field, a clear offer, a short URL, and an opt-out instruction. That is your template. Timing matters more than most operators realise. Messages sent within five minutes of a trigger event - like a visit ending, or a lapse threshold being crossed - achieve click-through rates of up to 36%, versus 9% for scheduled broadcasts. Build your campaigns around behavioural triggers, not calendar dates. On the hardware side, Purple runs as a cloud overlay on top of Cisco Meraki, HPE Aruba, Ruckus, Juniper Mist, Ubiquiti UniFi, Cambium, Extreme, and Fortinet access points. You do not need to replace your existing infrastructure. The captive portal and data capture layer sits above the network. That is the hardware-agnostic architecture that makes deployment fast - typically two to four weeks from contract to live campaigns. [medium pause] Right, let's talk about what goes wrong. The most common mistake is treating SMS as a broadcast channel rather than a relationship channel. If you send more than four messages a month to any individual, your opt-out rate will climb above 3.5% - which is the threshold where your list starts degrading faster than you can grow it. Frequency discipline is non-negotiable. The second mistake is poor consent architecture. Under GDPR, consent for SMS marketing must be freely given, specific, informed, and unambiguous. Bundling it with the WiFi terms of service is not valid consent - the ICO has been clear on this. The consent checkbox must be separate, unticked by default, and the marketing purpose must be stated explicitly. Third mistake: no suppression list management. Every time someone opts out, that number must be added to a permanent suppression list that survives database migrations, CRM changes, and platform switches. A single message to a suppressed number is a PECR breach. Build the suppression logic into your data pipeline from day one, not as an afterthought. Fourth: ignoring delivery rate as a leading indicator. If your delivery rate drops below 95%, your list has quality problems. Run a list hygiene pass every 90 days. On the positive side - the implementation win that most operators miss is the post-visit trigger. The moment a guest's device disconnects from your WiFi and does not reconnect within 24 hours, that is your signal that the visit has ended. Fire the first re-engagement SMS at the 48-hour mark. That timing consistently outperforms weekly batch sends by a factor of three. [medium pause] Quick questions I get asked a lot. Do I need a separate SMS platform or does Purple handle it? Purple Engage has the campaign builder and segmentation engine built in. You connect your preferred SMS gateway - Twilio, Vonage, MessageBird, or others via API - and Purple handles the orchestration. What is the minimum list size to make bulk SMS worthwhile? In our experience, 500 verified, consented numbers is the floor. At 2,000 numbers you have enough to run meaningful A/B tests on message copy. How do I measure return visits from SMS? UTM parameters on your booking link, combined with WiFi reconnection data. When a guest who received an SMS reconnects to your WiFi within 30 days, Purple logs that as an attributed return visit. Can I run bulk SMS alongside email? Yes, and you should. SMS for time-sensitive, high-urgency messages. Email for richer content and nurture sequences. Purple Engage runs both channels from the same audience segments. [medium pause] So, to bring it together. Bulk SMS for marketing works when it is built on verified first-party data, segmented by behaviour, triggered by real events, and constrained by a tight compliance framework. Guest WiFi is the most efficient capture mechanism available to physical venue operators - it is on-premises, it is verified, and it is consented at the point of connection. The numbers are clear. 98% open rate. 19 to 36% click-through rate. Up to £71 returned per pound spent. Return visit uplift of 34% when segmentation is applied versus unsegmented broadcast. If you want to see how this works in practice, visit purple dot ai and look at the Engage plan. We have deployed this across Premier Inn, Whitbread, and AGS Airports, among others. The implementation timeline is two to four weeks. The data starts flowing on day one. Thanks for listening. If you have questions, drop them in the comments or reach out directly. We will see you next time.