Key Takeaways
- API production-readiness for an Android SMS gateway server is pairing, keys, DLR, OTP isolation, and a charged spare — not a green dashboard.
- Confirm send/webhook fields in OpenAPI the week you ship. Blogs drift; docs win.
- Free/Developer SMS caps are for canaries. Launch week needs a plan that matches device count.
- 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.
This API production-readiness checklist is for a gateway server that already talks HTTPS to an Android SMS gateway. If the SIM is dead, OEM killed the app, or OTP shares a promo radio, you are not ready — regardless of uptime on the VPS.
Service pricing is based on device count and total SMS sent through the gateway. Architecture: server guide. Contract: API docs.
A checklist that never mentions a spare charger is a demo script.
A go/no-go, not a vibe
Sign it. Name an owner. Delay launch if any row is red. Device setup.
Readiness table
| Gate | Pass | Fail |
|---|---|---|
| Secrets | Key in env, not the SPA | Key in a repo or theme |
| Idempotency | Stable key per challenge/order | New UUID on every timeout |
| Webhooks | HMAC + event-id dedupe | Open POST, no signature |
| Radio | Paired, exempted, funded, spare | One phone on Wi-Fi lab |
| OTP vs promo | Separate deviceIds | Shared SIM |
API and secrets
Bearer JSON, POST /messages. Retry policy: retry backoff. 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.
Phones, airtime, spare
Count docks including failover. Backup device. Pricing.
Canary then OTP
Staff numbers, cold handset, then customer login. OTP.
Checklist
- OpenAPI checked this week.
- Webhook signature test (tamper fails).
- Spare paired and funded.
- OTP isolated.
- On-call named.
- Rollback: disable send flag.
Next steps
Pair via downloads, run the table as a meeting, then ship or stop.
Related product pages
Jump to the live product docs for this topic—not another long-form article.
- SMS API documentationLive endpoint reference
- device and SMS volume pricingPlans and allowances
- Android SMS gateway product guideDefinition, product, and how to buy
- download the Android gateway appGet the APK
