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Channel · SMS

Your phone's SIM,
sending SMS for you.

Install the free Android app and sign in: your SIM sends and receives SMS from the web app, Claude, ChatGPT, n8n or the API. Your number, your plan.

Download the APKCreate a free account

Version 0.1.2 · Android 8.0 or newer · MIT licence · All versions · Source code

QR code linking to the latest Unlimited Messaging APK

On a computer?

Scan this code with your Android phone to download the APK.

How it works

Ready in two minutes

  1. Install the app

    Download the APK on your Android phone, or scan the QR code, and allow the install for this app.

  2. Sign in

    Open Unlimited Messaging, sign in, allow SMS access and set the battery to Unrestricted. The app guides you.

  3. Your SIMs appear

    Each SIM shows up as an SMS account in your dashboard, ready to send. Dual SIM phones get two.

The message received

A normal SMS, from your number

It leaves from your phone's SIM, so your customer sees the number they already know. Their replies come back to your inbox.

Le Petit Zinc

+33 6 12 34 56 78

Le Petit Zinc: see you tomorrow at 8 pm, table for 4. Reply 1 to confirm.

17:30

1

17:32

Send it from

Show the API request
POST /messagecurl
curl https://api.unlimitedmessaging.app/message \
  -H "Authorization: Bearer $UM_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
        "to": {
          "phone": "+33612345678"
        },
        "channels": [
          {
            "channel": "SMS"
          }
        ],
        "text": "Le Petit Zinc: see you tomorrow at 8 pm, table for 4. Reply 1 to confirm."
      }'
The same SMS from your code, with your API key. The SDKs, the n8n node and the MCP server send SMS too.

Good to know

Built for a human pace

  • Reminders, codes, replies

    Android lets an app send 30 SMS every 30 minutes, and we space sends to stay within it. Just right for everyday messages.

  • Text messages

    SMS carry text. For photos and files, the same message can also go out on WhatsApp or by email.

  • Set once, always on

    With the battery set to Unrestricted, the app stays connected with the screen off and restarts after a reboot.

FAQ

Questions about SMS

Turn your phone into an SMS gateway

Create a free account, install the app, and your next message can leave as an SMS from your own number.

Start for free

Free plan, no credit card. Android 8.0 or newer.