Android SMS Gateway Scenario 246: Real-estate scheduled SMS in practice

Summary

Scenario 246 schedules HOA / service-charge SMS from Android SIMs at the managing agent — not rent books, not sales boards. 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 owner paid at 23:40 and the +10 still fires at 08:00, you have a cron, not a levy programme.

Not a CodeCanyon “housing SMS” template pack. You keep the agent MSISDN — Twilio vs Android SMS gateway.

Key takeaways

• Scenario 246 is HOA / service-charge SMS on the building clock — not rent arrears, not viewings, not key day.
• Owner-portal OTP stays off the levy-dunning SIM.
• 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.
• A payment posted overnight must kill the 09:00 +10 text.
• Dunning/levy reminders are promotional enough for STOP in many markets — do not invent a waiver.
• Spare radio at the managing-agent desk beats a brochure SLA on levy day.

Related reading

scheduled SMS, SMS auto-reply and STOP keywords, OTP and 2FA SMS, FCC unwanted-text guidance.

Context

Blocks juggle sinking funds, portal logins, and AGM notices. The failure is a phone in a caretaker’s bag on levy day, not “the API.”

Free (300 SMS lifetime) is one building’s canary. Developer is 25,000 SMS per year.

Core scenario guidance

Jobs keyed to unit_id + levy_period. Re-read the ledger before fire. Drain when status is paid.

Copy: who you are, period, how to pay, how to STOP marketing. No gate codes in dunning texts.

HOA levy vs portal OTP

Cost and ownership

Priced by devices and SMS send volume. You use your own phone and operator SMS credit. Name who tops up the agent SIM before levy week. Retries still spend airtime.

A second estate is another device if it needs its own 09:00 radio.

Operations

T-1: pairing, battery, unpaid count vs queued jobs. After OEM updates, canary at 09:00 local.

Abort: pause +10, keep portal OTP, drain paid units.

Security and compliance

Minimize amounts in group logs. Rotate keys when a contractor block-management zap dies. STOP on dunning/marketing.

OTP bodies out of caretaker WhatsApp.

Decision guide

Ship when paid status drains +10. Delay if “levy day” is a spreadsheet with no zone. If the desk cannot host a phone, CPaaS for OTP and honesty about reminder delay.

Checklist

• Building IANA zone stored.
• Jobs keyed to unit_id + levy_period.
• Paid drains +10.
• OTP off levy SIM.
• STOP on dunning/promo.
• Spare charged at the desk.
• Staff canary at 09:00.
• Airtime before levy week.
• On-call for due morning.
• Developer Center if API-enqueued.

Next steps

See scheduled SMS, device and SMS volume pricing, SMS API documentation.

Deep dive: production hardening

Caretaker-pocket phones sleep. Desk charge only.

Dual-SIM remap: portal OTP must not hop to dunning.

No MMS “pay now” posters. Use HTTPS you control.

No auto-reply AGM flyer into a 2FA thread.

Deep dive: scaling and failure modes

Portfolios scale by device count. Uncapped platform volume is not extra 09:00 radios. Starter, Professional, and Business list Unlimited SMS as platform send volume; that is not unmetered carrier SMS.

A late bank file is an OTP spike plus a dunning CSV. Hold +10; keep portal codes.

Developer still caps at 25,000 SMS per year.

Deep dive: integration discipline

Idempotency on unit_id + levy_period + offset. Block-management retries are normal.

If an agent desktop drives SMS, 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.

Levy-week board

T-1: kill jobs whose ledger flipped to paid overnight.

08:50 on due-day: pairing + airtime. Red means page before 09:00 fire.

Abort: pause dunning, keep OTP, drain paid. If a junior can still blast the roll, you have no schedule.