Key Takeaways
- Scenario 870 is building-inspection SMS: buyer and inspector get a timed window, not a Saturday open-house blast.
- A slipped inspector time must cancel both holds before a new pair fires.
- Lockbox codes do not go in the first SMS. Confirm identity on the inbound thread.
- Listing promo stays off this radio. Portal OTP stays on another phone.
- 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 870 is a sales team coordinating buyer + inspector on a weekday access window. Not viewing nurture, not open-house RSVPs. Two people, one 90-minute slot, two scheduled SMS, one inbound number for “running late.”
Priced by devices and SMS send volume. You use your own phone and operator SMS credit. Architecture · Developer Center. GSMA.
Inspection trio, one clock
CRM event: inspection booked. Holds: T-24 logistics (no address dump), T-2 “window still 09:00–10:30.” Timezone is the property. Agent laptop TZ is how you text at 06:00 by accident.
If the inspector slips to 11:00 and the buyer still gets “be there at 09:00,” you burned a lockbox visit and a relationship.
Buyer, inspector, OTP
| Party | SIM | Hold key | Inbound |
|---|---|---|---|
| Buyer logistics | Inspection phone | inspectionId + buyer | LATE / STOP-promo only |
| Inspector logistics | Same phone OK | inspectionId + inspector | SLIP cancels pair |
| Portal OTP | Dedicated | Auth | Ignore |
Device caps: 2 / 5 / 15.
90-minute access window
Do not put the full address in SMS 1. Quiet hours still apply for any promo you were tempted to attach. Timezones.
Inspector late — kill and re-hold
SLIP inbound or CRM reschedule deletes both outstanding holds, then writes new send-at. Idempotent. REST samples: PHP, C#. MCP wraps REST.
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. Failed retries still cost the SIM. Pricing.
Tuesday 07:00
Inspection days cluster Tuesday–Thursday. Canary Monday. Doze exempt. Setup · STOP.
Lockbox codes
Staff-released, short-lived, not in the scheduled body. Rotate API keys. Not a CodeCanyon listing kit.
WhatsApp group instead
If both parties already live in a managed chat, SMS may be backup only. Keep Android when you need a logged MSISDN and CRM write-back.
Checklist
- Paired holds; slip cancels both.
- Property TZ on the listing.
- No lockbox in SMS 1.
- OTP on another device.
- Promo off this radio.
- Monday canary before inspection week.
Next steps
Book a fake inspection, slip the inspector, prove buyer SMS is cancelled. Downloads · Docs.
Related product pages
Jump to the live product docs for this topic—not another long-form article.
- scheduled SMS campaignsSend later windows
- transactional SMS for orders and alertsEvent-driven messages
- SMS auto-reply and STOP keywordsOpt-out and keywords
- SMS API documentationLive endpoint reference
