Show HN: Send SMS from your own Android phone via API

1 nikola470 0 9/11/2025, 1:31:30 PM simgate.app ↗
Hi HN,

I built a small developer tool called *SimGate*.

Problem: most SMS APIs (Twilio, etc.) charge per-SMS. For small projects, prototypes, or local businesses, this adds up quickly.

What I made: - An Android app that connects your phone to the cloud via WebSocket. - A simple REST API where you send JSON (`deviceId`, `phoneNumber`, `message`). - Your phone sends the SMS using its own SIM plan — no extra per-SMS fees.

Use cases: OTP codes, alerts, internal tools, or any project where you just need reliable SMS without provider costs.

Stack: Node/Express + Websockets (backend).

Demo & docs: https://simgate.app

This is my first SaaS launch. I’d love feedback: - Would you use this for side projects or small businesses? - Any concerns about reliability/security with this model?

Thanks!

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