Reliability
SMS quotas and choosing a plan
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
An integration can hit its monthly quota during the working day. A limit error should not turn into endless repeated requests.
Build the solution
Monitor dashboard usage and estimate confirmed business events. Free includes 250 outgoing messages and one phone. Paid plans increase quotas; retrying the same idempotent job does not consume quota again.
Check before launch
Unused quota does not roll over. Jobs cancelled after acceptance still count. When downgrading, check phone counts and permitted sends.
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.
