Key Takeaways
- Scenario 976 is 08:10 assembly-cancelled form-time failover — not exam-window, homework, enrollment, snow-day, PTC, results, late-bus, field-trip, after-school, lunch till, away-fixture, inset, sports-rain, seating swap, swim cancel, or minibus 15:20.
- A spare that IT racks at 16:00 yesterday and unplugs at 07:30 is not hall-day HA.
- Priced by devices and SMS send volume. You use your own phone and operator SMS credit. Free is 300 SMS lifetime, 1 device. Developer is 25,000 SMS per year.
- Starter is 2 devices; the spare still counts.
- Hold PTA lists until the last form-room notice drains.
- Canary both radios at 07:50, not at the 16:00 health check.
Summary
Scenario 976 is a closed hall: form rooms at 08:10, a spare already paired, PTA held until notices drain.Service pricing is based on device count and total SMS sent through the gateway. You need a working Android phone with a SIM and SMS credit from your mobile operator. Operator message costs are yours—we do not sell carrier SMS balance.
If the hall leaked and the spare is in a drawer, you did not fail over. You hoped parents would guess form time.
Not a CodeCanyon “school SMS” pack. Device meters apply — Twilio vs Android SMS gateway.
Key takeaways
- Scenario 976 is 08:10 assembly-cancelled form-time failover — not exam-window, homework, enrollment, snow-day, PTC, results, late-bus, field-trip, after-school, lunch till, away-fixture, inset, sports-rain, seating swap, swim cancel, or minibus 15:20.
- A spare that IT racks at 16:00 yesterday and unplugs at 07:30 is not hall-day HA.
- Priced by devices and SMS send volume. You use your own phone and operator SMS credit. Free is 300 SMS lifetime, 1 device. Developer is 25,000 SMS per year.
- Starter is 2 devices; the spare still counts.
- Hold PTA lists until the last form-room notice drains.
- Canary both radios at 07:50, not at the 16:00 health check.
Related reading
education SMS, multi-device SMS, how an Android SMS gateway works, GOV.UK school attendance.
Context
Estates call the hall at 07:35. Parents leave the house at 08:00. PTA still wants a raffle CSV.
Free (300 SMS lifetime) is a rehearsal year-group. Developer is 25,000 SMS per year.
Core scenario guidance
08:10 is cancel + form rooms. Spare is live before 07:50. Timezone is the campus, not the MAT HQ.
Assembly-cancel failover roles
| Role | When | Typical fail |
|---|---|---|
| Cancel + form rooms | 07:55–08:40 parent local | Phone in a locked hall office after 07:30 |
| Hot spare | Primary unpaired or submit errors | Unplugged when staff checked the hall |
| Parent portal OTP | Transactional, own pool | Dumped onto the hall SIM |
| PTA / merch | Held until last form notice | Released at 08:00 into cancel SMS |
Cost and ownership
Priced by devices and SMS send volume. You use your own phone and operator SMS credit. The hall spare is a billed device. Resends burn airtime.
Name a 07:30–09:00 on-call for hall mornings, not only IT weekdays.
Operations
07:50 canary both radios. Abort: hold PTA, keep OTP, skip a second “all year groups” blast. Do not “resend campus.”
Security and compliance
Short bodies. No pupil names plus medical flags in one SMS. Authenticate MIS hooks. PTA lists are promotional.
Decision guide
Ship when 07:50 canary is green and the spare is already paired. Delay if phones lock in the hall office after 16:00. If handsets are forbidden, CPaaS for portal OTP.
Checklist
- Primary + hall spare paired overnight.
- 07:50 canary.
- Spare live before 07:55.
- OTP isolated.
- PTA held.
- Airtime before 07:30.
- Battery exemptions both OEMs.
- Campus locale.
- Hall-morning on-call named.
- Device cap includes spare.
Next steps
Review device and SMS volume pricing, device setup, SMS API documentation.
Deep dive: production hardening
Caretakers pulling USB at 07:20 is an outage at 08:10. Watch DLR, not MIS 200s.
Deep dive: scaling and failure modes
Multi-campus hall weeks add devices before inventing a hidden unlimited-handset SKU. Raise OEM ceilings; fair-use remains.
Deep dive: integration discipline
Idempotency on campus_id + hall_date + kind (cancel|form). MCP is a REST wrapper — live fields in Developer Center.
Priced by devices and SMS send volume. You use your own phone and operator SMS credit.
07:50 hall drill
Canary both radios. Fail the primary; confirm cancel DLR on the spare. Hold PTA during the wave.
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
