How can a small business send automated SMS to customers without Twilio?

Install SMS Gateway Master on your Android phone. Use the REST API with Python, PHP, or a no-code tool like Zapier to send SMS automatically. The app routes messages through your own phone and carrier — no Twilio account needed, no per-message fees. €5/month flat rate.

Can I send customer SMS from Excel or Google Sheets?

Yes. SMS Gateway Master provides ready-to-use Excel VBA macros and Google Apps Script code. Open your spreadsheet, add phone numbers in one column and messages in another, run the script, and all messages are sent via the REST API. Download scripts at https://sms-gateway-ae7e1.web.app/ready-to-use.html

How many SMS can I send per day to customers?

On the PRO plan: up to 10,000 SMS per day. On the free trial: 100 SMS per day. Most small and medium businesses never exceed 10,000 daily messages. For higher volumes, carrier daily limits may also apply.

Can I personalise each SMS with the customer's name or order details?

Yes. The API accepts any string in the 'message' field, so you can dynamically build personalised messages in your code before sending. For example: 'Hi Maria, your order #1042 has shipped!' — just construct the string in Python, PHP, or your automation tool.

Send SMS to Your Customers – Automatically

Who Uses SMS Gateway Master to Reach Customers

You don't need to be a developer. If you have an Android phone and a computer, you can automate customer SMS today.

🛍️

Online Stores

Send automatic order confirmations, shipping notifications, and delivery alerts to customers via WooCommerce or Shopify webhooks.

→ WooCommerce guide

🏪

Local Businesses

Appointment reminders, booking confirmations, special offers, opening hours — reach your customers directly on their phones.

👩‍💻

Developers & SaaS

Integrate the REST API into your backend to send OTP codes, system alerts, status notifications, and 2FA messages.

→ API documentation

🏠

Home Automation

Send SMS alerts from Home Assistant, Node-RED, Raspberry Pi, or any IoT device. Power, security, temperature — always notified.

How It Works — 4 Simple Steps

No technical background required. You only need the app on your phone and a way to make an HTTP request.

1

Download the app & get your API key

Install SMS Gateway Master from Google Play. Sign in with your Google account. Go to Settings → API Key and copy your unique key. This takes under 2 minutes.
2

Choose your integration method

Pick the tool you already use: WooCommerce (PHP hooks), Zapier (no-code), Google Sheets (Apps Script), Excel (VBA), Python, or any tool that can make an HTTP POST request. Ready-to-use code for all platforms is available at ready-to-use.html.
3

Send an HTTP POST to the API with your customer's phone and message

Your request goes to a Firebase Cloud Function which forwards it securely to your Android phone via FCM. The phone sends the SMS using Android's native SmsManager through your carrier. No message content is stored in the cloud.
4

Receive delivery confirmation via webhook

Optionally include a webhookUrl in your request. The app will POST the delivery status (sent / delivered / failed) back to your server so you always know whether the customer received the message.

What Types of SMS Can You Send to Customers

🛒 Order Confirmation

"Your order #1234 has been received. Estimated delivery: 3-5 days."

📦 Shipping Update

"Your package has shipped! Tracking number: ABC123."

📅 Appointment Reminder

"Reminder: Your appointment is tomorrow at 10:00. Reply CONFIRM or CANCEL."

🔑 OTP / 2FA Code

"Your verification code is: 481920. Expires in 10 minutes."

🎁 Promotions

"Exclusive offer: 20% off this weekend only. Use code SAVE20."

⚠️ System Alerts

"Server CPU at 95%. Automated alert from monitoring system."

Why There Are No Per-Message Fees

Most SMS APIs (Twilio, Vonage) charge $0.007–$0.008 per message because they route through their own cloud infrastructure and carrier agreements. SMS Gateway Master works differently.

✅ SMS Gateway Master

Routes through your own Android phone
Uses your carrier's SMS plan (usually included)
Flat €5/month — no per-message billing
Your message content never leaves your device

❌ Twilio / Vonage

Routes through their cloud SMS infrastructure
You pay $0.0075+/SMS regardless of volume
10,000 SMS = ~$75/month
Your messages pass through their servers

Works With the Tools You Already Use

No complex setup. If your tool can make an HTTP request, it works with SMS Gateway Master.

🛒 WooCommerce

🛍️ Shopify (webhooks)

📋 Google Sheets

📊 Excel VBA

⚡ Zapier

🔧 Make (Integromat)

🐍 Python

🐘 PHP

🟩 Node.js

🏠 Home Assistant

🔔 Node-RED

🖥️ Bash / cURL

→ Download ready-to-use scripts for all platforms

Two-Way SMS — Let Customers Reply

Not just outbound — receive customer replies and respond automatically in real time.

📩 Order Confirmations

Send "Your order is ready — reply YES to confirm pickup or NO to cancel." Customer replies reach your server instantly and trigger the right action.

⭐ Customer Feedback

Send "Rate your experience 1–5." Customer replies are forwarded to your server and stored automatically in your CRM or spreadsheet.

🤝 Customer Support

Let customers reply to your SMS alerts. Route replies to your support team or an AI model — and auto-send the response back via the same thread.

⚙️ How It Works

Customer replies to your SMS
SMS Gateway Master receives the reply on-device
The app instantly POSTs the message to your webhook URL
Your server processes it — and optionally returns {"sms_text": "Thanks! Your order is confirmed."}
The app automatically sends the reply back to the customer

Two-Way SMS Guide → API Documentation

FAQ — Customer SMS Automation

Do I need technical skills to send customer SMS? ▼

Not necessarily. If you use Zapier or Google Sheets, no coding is required — just paste your API key and configure the action. For WooCommerce or Shopify, you'll need basic PHP or webhook knowledge. For full automation, Python or Node.js are easy to use with our ready-to-use scripts.

Can I personalise SMS messages with each customer's name? ▼

Yes. The API accepts any string in the message field. Build your message dynamically in your code or automation tool: "Hi " + customer_name + ", your order has shipped!". Every SMS can be fully personalised.

Does SMS Gateway Master work with Zapier? ▼

Yes. Use Zapier's Webhooks by Zapier action (POST method). Set the URL to the API endpoint, add the X-API-Key header, and set the JSON body with phoneNumber and message. Connect it to any Zapier trigger — new WooCommerce order, Google Form submission, new Shopify order, and more.

How many customers can I SMS per day? ▼

PRO plan: up to 10,000 SMS/day. Free trial: 100 SMS/day. For bulk marketing SMS to thousands of recipients, see the Bulk SMS guide.

Is customer data kept private? ▼

Yes. SMS Gateway Master uses a local-first architecture. Customer phone numbers and message content are routed through a Firebase function only for delivery coordination — the message body itself is sent directly from your phone and is never stored in any cloud database.

Send SMS to Your Customers– Automatically