Key Takeaways
- Scenario 780 is booking-deposit OTP: the customer cannot hold the Saturday slot until the bank code lands.
- Reminder SMS for existing bookings waits. Promo never enters this radio.
- Do not pile deposit retries behind a 200-row reminder CSV.
- Free is one device — if it sends OTP, it does not send “book this week.”
- 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 780 is a salon, studio, or clinic that takes a deposit in the booking app. Until the OTP confirms the hold, the chair is not sold. Waitlist fills and T-24 reminders are different clocks. This radio exists so Saturday brides can pay at 21:00 without waiting behind a reminder dump.
Priced by devices and SMS send volume. You use your own phone and operator SMS credit. Developer Center. GSMA.
Deposit OTP is the chair
Rank: (1) deposit / login OTP, (2) same-day reminder, (3) T-24, (never) promo. Idempotency: payment intent id. Expire the slot hold when the code expires — do not keep the chair locked while the radio is behind a CSV.
If a reminder wave delays the deposit code, you will refund a slot you never really held and lose the Saturday that paid the rent.
Hold, reminder, promo
| Lane | Device | Key | Late policy |
|---|---|---|---|
| Deposit OTP | Dedicated | intent id | Expire hold with the code |
| Reminders | Second SIM | appointment id | Skip if slot started |
| Win-back | Promo MSISDN | list id | STOP |
Caps: Starter 2, Professional 5, Business 15.
Code expiry vs slot hold
Align clocks. REST: PHP, C#. MCP wraps REST. Raise OEM ceilings carefully; carrier fair-use still applies.
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. Pricing.
Friday wedding rush
Canary staff deposits. Spare charged OTP phone. Setup · STOP on promo only.
Card OTP bodies
Do not log full codes. Rotate keys. Not a CodeCanyon deposit pack. Your SMS is not the bank’s 3DS message.
Pay in person
If you refuse a second device, take deposits at the desk. CPaaS if you refuse phones.
Checklist
- Deposit OTP on dedicated radio.
- Hold expires with the code.
- Reminders cannot POST to OTP device id.
- Friday canary.
- Airtime owner named.
Next steps
Enqueue 200 reminders and one deposit OTP; prove OTP latency stays flat. 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
