Key Takeaways
- Scenario 460 is an after-school club cancellation at 14:00: coach no-show or hall flood. The activities SIM dies under the parent spike — a spare already paired takes the rest. Not heat-index dismissal, Sunday LMS, or sub-teacher OTP.
- Parents who get silence will arrive at an empty gym. The product is the second radio.
- Do not SMS child names or the coach’s mobile in message 1. Club name, pickup rule, and a short URL 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 460 is an activities office when the hall roof leaks at 13:40. Chess and robotics are off. Parents need one text before pickup. Heat-index early-out and exam failover are the wrong list.
Priced by devices and SMS send volume. You use your own phone and operator SMS credit. Failover · Developer Center. GSMA.
Club cancel, not dismissal
Split club lists across two device ids before send. Fail closed if both SIMs reject.
If you find the spare in a PE cupboard after the first two clubs fail, you ran a car-park argument, not a cancel.
After-school vs LMS
| Lane | Body | Failover | Device |
|---|---|---|---|
| Club off | Name, pickup | Split list | Office + spare |
| LMS / exam | Code | Class modem | Separate |
| Staff portal OTP | Digits | Auth | Dedicated |
Caps: 2 / 5 / 15.
Spare already paired
Health-check both radios at 13:00 on wet days. REST: PHP, C#. MCP wraps REST.
No child names
Club and pickup only. Identity on inbound if they reply WHICH DOOR.
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.
14:00 blast
Club SIMs
Log campaign id + device id, not the roster in chat. Rotate keys. Not a CodeCanyon clubs pack.
Two SIMs or a call tree
If you will not keep a hot spare on wet days, do not promise SMS cancels.
Checklist
- Spare paired at lunch.
- List split before send.
- No names in templates.
- Staff OTP elsewhere.
- Webhook signatures.
Next steps
Kill the activities SIM mid-test list; prove the spare finishes the remainder. 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
