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Dev tools · August 25, 2025

SimGate

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 &…

SimGate launched on August 25, 2025 with 6 votes. The site was still online in September 2026, 1 year on.

What it does

Use your own Android phone as an SMS gateway. Send SMS via simple API call from your frontend or backend - messages are sent through your phone’s SIM, not a third-party service. Simple integration and total control of your own gateway without pay-per SMS.

SimGate turns your phone into a powerful SMS gateway. Send and receive text messages through your own SIM card with a simple, private API — no pay per SMS cost.

SimGate turns any Android phone into a programmable SMS gateway. Send and receive text messages over a plain HTTP API through your own SIM — no per-message fees, no third-party provider in the middle. 1 curl -X POST https : //api.simgate.app/v1/sms/send 2 -H "x-api-key: YOUR_API_KEY" 3 -H "Content-Type: application/json" 4 -d ' { 5 "deviceId" : "android-5q15b182f2704gbz" , 6 "phoneNumber" : "+1234567890" , 7 "message" : "Hello from SimGate API!" 8 } ' Your backend → SimGate API → Your Android phone → Delivered Privacy by default The content of the SMS you send through SimGate is never stored in our databases. Your message is relayed to your phone for delivery, not archived on our side.…from simgate.app

In the maker’s words, at launch

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…

Does a similar job

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