Lock Screen Marketing: The Channel No One Ignores
Lock screen marketing is the most direct path to your customers: a short message appears on the screen everyone looks at dozens of times a day. The best part: you don't need your own app. The digital stamp card in the wallet brings the channel with it. This article explains how it works, what's legal, and which messages actually drive visits.
How messages reach the lock screen without an app
Apple Wallet and Google Wallet come pre-installed on virtually every smartphone. Both can display notifications for saved cards. This is the same technology behind boarding passes that pop up on your lock screen before a flight—and it's exactly what a digital stamp card uses.
Here's how it works:
- The customer scans your QR code and saves the card in their wallet.
- You write a message in the dashboard, or an automation triggers one.
- The card updates, and the phone shows the change as a notification on the lock screen.
- A tap opens the card with the current stamp count and your offer.
No app download, no phone number, no email address. The card is the channel. For a customer's perspective on how card creation works, see What is a Wallet Pass?.
Why the lock screen works differently than email
The difference is attention. A newsletter competes with dozens of other emails and often gets archived unread. A lock screen message stands alone, is brief, and appears exactly when the customer looks at their phone.
| Channel | Customer needs | Visibility | Effort for you |
|---|---|---|---|
| Newsletter | Email address, opt-in | In full inbox | Write text, design, send tool |
| WhatsApp Business | Phone number, opt-in | High, but personal | Manage numbers, possible per-message costs |
| Own app | App download | High | App development, maintenance |
| Social media | Follows you | Depends on algorithm | Post regularly |
| Wallet message | Card in wallet, marketing checkbox | Lock screen | One sentence in dashboard |
There's a second effect: the message is tied to the card. The customer doesn't just see "2 for 1 today"—they see "7 of 10 stamps" at the same time. Offer and progress reinforce each other.
What's legal
Lock screen messages with offers are marketing. You need the customer's consent, which they give when creating the card: a separate, unchecked-by-default box for offers and promotions, separate from program participation.
Messages that are part of the program aren't marketing: "You now have 8 of 10 stamps," "Your reward is ready," "Your reward has been redeemed." Every cardholder can receive those.
Rule of thumb: anything meant to encourage a purchase needs the checkbox. Anything about the card's status doesn't. For the legal background, see GDPR and Loyalty Programs. Good software separates both types automatically, so marketing only goes to customers who've consented.
Which messages drive visits
Not every message works the same. From small shops in practice, five types have proven effective:
- Time-limited offer: "Today only until 6 PM: second coffee free." The deadline creates urgency to come in today.
- Quiet-day booster: "Tuesday is double-stamp day." Spreads visits across slower days.
- Win-back: "Haven't seen you in a while, Lena. Your next stamp counts double." Automatically goes to customers who haven't visited in 14 days.
- Birthday: "Happy birthday! Your favorite drink is on us today." Personal and effective if the customer shared their birthday.
- Almost there: "Just 2 stamps left for your free cappuccino." Reminds them of the reward they're close to earning.
Less effective are generic messages without a reason ("Stop by again") and long texts. The message has one or two lines on the lock screen. Anything longer loses the reader.
How often to send: the frequency question
The lock screen is a personal space. Send too often and you're seen as a nuisance—the customer deletes the card. Then the channel is gone forever.
Proven frequency:
- Automatic messages (stamp count, reward ready, win-back, birthday): run in the background, only arrive when there's a real reason.
- Your promotions: one or two per week, ideally on a fixed schedule, like every Tuesday.
- Seasonal: in addition to holidays or season starts, no more than once a month.
Watch your dashboard to see if cards get deleted after a message. That's the most honest signal for "too much." Also note that wallet providers themselves limit notifications per card per day.
Reminder nearby: the location effect
Wallet cards can also appear location-based. When a customer is near your shop, the card appears with a brief reminder on their lock screen without you sending anything. That reminds them at exactly the right moment—like when someone passes your café on the way to work.
This feature (geofencing) is included in stampa's Growth plan and uses only the wallet's location function. You never see the customer's movement data; the phone decides locally whether to show the card.
Writing messages: three rules
- Use their name if you have it. "Hi Lena" reads differently than "Dear customers."
- One offer, one deadline, one sentence. Cut everything else.
- Specific beats vague. "Second cappuccino free" beats "great offers."
If writing is hard: stampa's AI suggests message texts you can accept or edit. More examples and templates are in Send Push Notifications to Customers.
Conclusion
Lock screen marketing is the channel with the highest attention, and with a wallet stamp card you need neither an app nor a phone number. What matters is separate marketing consent, concrete messages with a reason, and frequency that doesn't bother customers. With stampa, you write promotions in the dashboard or let automations spot the reason. You can start free, up to 100 active customers, no credit card needed.