Reliability
Message queues during an internet outage
Implementation scenario · This is an example implementation, not a story about a named customer. Results depend on your integration, phone, network and carrier.
AI-generated scenario illustrationThe problem
The server can accept SMS while a phone is unavailable. Queuing waits for connectivity; it does not make the message instantly sent.
Build the solution
Show queued separately from sent and delivered in your CRM. Monitor device last-seen time and order relevance. Cancel stale notifications before the phone receives them when that is still possible.
Check before launch
Test a longer outage and reconnection. The phone queue has a limit, so handle a full queue instead of endlessly retrying requests.
How SIM Bridge works
Your backend creates a job through the API, and the connected Android sends SMS through your SIM. Store the message ID in your system and receive status changes through a webhook. A queued job is not yet a sent message: the phone must be available and the carrier must accept it.
Start with your own test number. Check Android permissions, screen-off connectivity, retries with the same Idempotency-Key, and unknown-status handling. Keep API keys out of browser code and public repositories.
