Key Takeaways
- Scenario 1720 is an overnight bus-route change blast at 05:50: the routes SIM dies under the parent spike — a spare already paired takes the rest. Not graduation reprint, SIP, or pickup-change.
- Families who get silence will clog the wrong corner at 06:40. The product is the second radio.
- Do not SMS student names or GPS traces in message 1. New stop, time, and a short PIN if you must.
- Staff portal OTP stays on another device.
- 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 1720 is a transport desk. Parents get “route 12 now Maple & 4th, 06:42.” The routes SIM cooks at 05:50. A spare already hot takes the rest. Ticket reprints and SIP locks are the wrong list.
Priced by devices and SMS send volume. You use your own phone and operator SMS credit. Multi-device · Developer Center. GSMA.
Route change, not reprint
Pair the spare the night a detour posts. 05:52 is a failover, not a firmware update.
If 90 parents were queued and one radio died, the old stop filled with cars and an empty bus.
Stop SMS vs LMS
| Lane | Body | Failover | Device |
|---|---|---|---|
| Stop / time | Corner, clock | Spare at 05:50 | Routes + spare |
| Staff LMS OTP | Digits | Never share | Dedicated |
| Names / GPS | Do not SMS | — | — |
Caps: 2 / 5 / 15.
Spare already paired
Mid-blast pairing fails. Failover. REST: PHP, C#. MCP wraps REST.
No student names
Stop and time only. Confirm identity on inbound STOP.
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.
05:50 blast
Doze exempt before dawn. Doze · Setup.
Route SIMs
Log route id + device, not names in chat. Rotate keys. Not a CodeCanyon bus pack.
Two SIMs or a queue
If you will not keep a hot spare, do not promise 05:50 route SMS.
Checklist
- Spare paired overnight.
- No names in templates.
- OTP on another device.
- Webhook signatures.
- Both handsets charged at 05:00.
Next steps
Kill the routes SIM on a canary list; prove the spare finishes before 06:10. Downloads · Docs.
Related product pages
Jump to the live product docs for this topic—not another long-form article.
- multi-device and dual SIM routingCapacity and failover
- OTP and 2FA SMS on AndroidAuthentication flows
- SMS delivery reports (DLR)Delivery status tracking
- SMS API documentationLive endpoint reference
