Key Takeaways
- Scenario 840 is same-day waitlist fill: a cancelled chair texts a short list. Portal OTP still ranks first on the radio.
- First YES must lock the slot and suppress the rest. Late YES is a second incident.
- A ten-number blast is a burst. Do not put it on the login SIM.
- Waitlist SMS is opted-in logistics, not a win-back campaign. STOP still applies if you reuse the list for promo.
- Priced by devices and SMS send volume. You use your own phone and operator SMS credit. Free: 1 device / 300 SMS lifetime / 300 contacts. Developer: 25,000 SMS per year.
Android SMS gateway scenario 840 is a salon or physio desk that texts a waitlist when someone cancels at 11:40. The chair is the product. The failure is blasting ten numbers from the same Android that sends booking-portal OTP — lunch login codes queue behind YES/NO.
Priced by devices and SMS send volume. You use your own phone and operator SMS credit. Developer Center. GSMA.
Waitlist fill is still second
Rank: (1) portal OTP, (2) same-day waitlist offer, (3) ordinary reminders, (never) promo. If you only have 1 device on Free, do not enable waitlist SMS on that SIM.
If two people get YES confirmation for one chair, you did not have a queue — you had a race on the radio.
OTP, fill, promo
| Lane | Device | Inbound | Stop condition |
|---|---|---|---|
| Portal OTP | Dedicated | Ignore | N/A |
| Waitlist offer | Fill radio | YES / NO | First YES locks slot |
| Win-back | Promo MSISDN | STOP | Consented list only |
Caps: Starter 2, Professional 5, Business 15.
First YES wins the chair
Idempotency: slot id + guest id. After lock, send a short “taken” to remaining offers or suppress silently if you said you would. Wire inbound to the PMS. Two-way.
Ten texts in one minute
That is a radio burst plus parts if Unicode. Count airtime. Raise OEM ceilings carefully; carrier fair-use still applies. REST: PHP, C#. MCP wraps REST.
Devices and airtime
Priced by devices and SMS send volume. You use your own phone and operator SMS credit. Free: 300 lifetime. Developer: 25,000 SMS per year. Paid tiers uncap platform volume, not carrier SMS. Pricing.
Noon cancellation
Canary a staff waitlist. Spare charged fill phone. Setup · STOP.
Waitlist consent
Joining a waitlist is not a licence to drip. Rotate keys. Not a CodeCanyon salon pack.
Call the list instead
If you cannot lock on first YES, call. CPaaS if you refuse phones.
Checklist
- Fill radio ≠ OTP radio.
- First YES locks; others suppressed.
- Waitlist opted in for fills only.
- Burst airtime budgeted.
- Staff canary before lunch rush.
Next steps
Cancel a staff slot, offer two numbers, prove only one confirmation. Downloads · Docs.
Related product pages
Jump to the live product docs for this topic—not another long-form article.
- OTP and 2FA SMS on AndroidAuthentication flows
- multi-device and dual SIM routingCapacity and failover
- SMS delivery reports (DLR)Delivery status tracking
- SMS API documentationLive endpoint reference
