Key Takeaways
- Deliverability on an open-source Android SMS gateway means canaries, DLR, and staff handsets — not “API 200 OK.”
- Wi-Fi paired + dashboard green is not proof the SMSC accepted the PDU.
- Isolate OTP from marketing before you trust percentages.
- Link the OSS hub; Developer Center owns live DLR fields.
- Budget airtime for measurement sends and retries.
- You bring the Android and operator credit. We meter devices and send volume.
Measure the radio path
Measuring deliverability for open-source Android SMS gateway deployments means proving messages leave the SIM and arrive on real handsets — not celebrating HTTP success. Hub: open source hub. Product DLR: delivery reports. Sibling: measure deliverability (app how-to).
A green pairing tile is Wi-Fi gossip. Deliverability is what the recipient’s phone shows.
What to track
| Signal | Means | Not enough alone? |
|---|---|---|
| API accept / queue | Gateway took the job | Yes — not delivered |
| DLR status | Operator/handset report | Watch unknown/expired |
| Staff canary | Human saw the SMS | Sample, not census |
| Device online | App paired | OEM may still block sends |
Canary method
Send to known staff numbers on the OTP pool before customer traffic. After OEM updates, re-canary. Two-way inbox for replies: two-way SMS. Live fields: Developer Center.
False greens
Do not mix promo blasts into the OTP denominator. External carrier docs vary — treat aggregator dashboards as a different product class (Twilio vs Android SMS gateway).
Cost
You bring the Android and operator SMS credit. Canaries and retries meter volume. Free: 1 device / 300 SMS lifetime / 300 contacts. See device and SMS volume pricing.
Checklist
- Staff canary numbers listed.
- DLR reviewed, not only HTTP.
- OTP pool isolated.
- Post-OEM retest scheduled.
- Spare charged device ready.
- Airtime budget includes canaries.
- OSS hub linked.
- Developer Center for live DLR fields.
Next steps
SIM plan choice: prepaid vs postpaid. OTP launch: API launch checklist.
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
