Key Takeaways
- Scenario 280 is an exam-hall seating change at 07:40: leak, invigilator shortage, or a blocked fire door. Exams office SIM dies under the parent/student spike — a spare already paired takes the rest. Not PTC night, late-bus, or Sunday LMS.
- Candidates who get silence will sit in the wrong hall. The product is the second radio.
- Do not SMS candidate names or seat numbers in message 1. Paper, new hall, and door.
- 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 280 is an exams office when Hall A floods at 07:15. Papers move to Hall C. Candidates need one text before 08:00. Conference nights and club cancels are the wrong list.
Priced by devices and SMS send volume. You use your own phone and operator SMS credit. Failover · Developer Center. GSMA.
Hall change, not PTC
Split papers across two device ids before send. Fail closed if both SIMs reject.
If you find the spare in a stationery cupboard after the first two papers fail, you ran a corridor argument, not an exam.
Seating vs LMS
| Lane | Body | Failover | Device |
|---|---|---|---|
| Hall move | Paper, door | Split list | Office + spare |
| LMS / join | Code | Class modem | Separate |
| Staff portal OTP | Digits | Auth | Dedicated |
Caps: 2 / 5 / 15.
Spare already paired
Health-check both radios at 06:30 in exam week. REST: PHP, C#. MCP wraps REST.
No candidate names
Paper and door only. Identity on inbound if they reply WHICH HALL.
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.
07:40 blast
Hall SIMs
Log campaign id + device id, not the candidate list in chat. Rotate keys. Not a CodeCanyon exams pack.
Two SIMs or a tannoy
If you will not keep a hot spare in exam week, do not promise SMS hall moves.
Checklist
- Spare paired night before.
- List split before send.
- No names in templates.
- Staff OTP elsewhere.
- Webhook signatures.
Next steps
Kill the exams 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
