What Is an SMS Message Gateway
Learn how an SMS message gateway works when an Android phone serves as the hardware bridge. FlixySMS details setup, cost savings, integrations with Shopify and Google Sheets, and delivery tracking.
TL;DR
An SMS message gateway forwards texts between applications and carriers. FlixySMS installs on Android and uses your existing phone and plan. It supports bulk sends at 30-100 messages per minute, auto-splits long texts, connects to Shopify and WooCommerce, and stores delivery reports without per-message fees.
An SMS message gateway routes messages from software to mobile carriers using a phone or server as the bridge. FlixySMS installs on any Android handset and handles that routing directly through your existing SIM and plan.
How the Android Phone Functions as the Gateway
FlixySMS runs as a background service on stock Android. It opens the SMS stack, queues outgoing messages, and listens for inbound ones. A single device sends between 30 and 100 messages per minute depending on carrier throttling. Add a second phone and the system splits the load across two modems for roughly double throughput.
The app auto-splits messages longer than 160 characters. It adds the required concatenation headers so the recipient handset reassembles the full text. No manual coding is needed.
See the full flow on the How it Works page.
Cost Model Versus Carrier APIs
Traditional providers charge between $0.0075 and $0.05 per message. FlixySMS charges nothing per message. You pay the monthly subscription and your carrier plan covers the actual airtime. A $25 per month Business plan plus an unlimited SMS carrier plan keeps the effective cost under 0.001 cent per message after the first 5000 sends.
Compare the tiers on the Pricing page.
Integrations That Trigger Messages
Shopify Order Events
Install the FlixySMS Shopify app. It listens for order confirmation, shipment, and abandoned-cart webhooks. Each event maps to a template that pulls the customer phone from the order record.
WooCommerce Hooks
The WooCommerce plugin registers on order status changes. You choose which statuses send an SMS and which template to use.
Google Sheets Bulk Upload
Upload a sheet with phone numbers and message columns. The app reads the sheet via the Google API and queues every row. One run can process 5000 contacts in under an hour on a single device.
Custom Webhooks
Any system that can POST JSON can trigger a send. The payload includes the phone number, message body, and an optional schedule time.
Read the exact payload schema in the API Documentation.
Contact and Group Management
Create groups by importing CSV files or by tagging contacts after an inbound message. A group can hold up to 25000 entries before performance drops. Scheduled campaigns reference these groups and send at the chosen hour.
Delivery Reports and Two-Way Replies
The app stores delivery status for every segment. Failed messages retry once automatically. Inbound SMS can trigger an auto-response based on keywords such as STOP or HELP. You configure the reply text once and the system handles compliance without further code.
Comparison Table
| Feature | Traditional API | FlixySMS Android |
|---|---|---|
| Per-message fee | $0.0075–$0.05 | $0 (carrier only) |
| Max speed per device | N/A | 30–100/min |
| Multi-segment handling | Manual | Automatic |
| Two-way auto-reply | Extra setup | Built-in |
| Integrations | REST only | Shopify, Sheets, etc |
API Example
POST /send
{
"to": "+15551234567",
"message": "Your order #4821 has shipped.",
"schedule": "2026-05-22T09:00:00Z"
}
Getting Started
Install the Android app from the Play Store, sign in at /dashboard, and grant SMS permissions. The first campaign can run within ten minutes.
View current plan limits before you scale.
Frequently Asked Questions
How does an Android SMS gateway differ from Twilio?+
FlixySMS runs on your own phone and SIM so you pay only the carrier rate plus a flat subscription. Twilio charges per message on top of its platform fee and does not use your handset.
What speed can one Android device achieve?+
A typical handset sends 30 to 100 SMS per minute. Carrier limits vary, but real-world tests on major US networks fall inside that range before throttling occurs.
Does FlixySMS handle messages longer than 160 characters?+
Yes. The app automatically splits longer texts into multiple segments and adds concatenation headers so the recipient phone reassembles them correctly.
Which platforms integrate directly with FlixySMS?+
Shopify, WooCommerce, Google Sheets, and any service that can call a custom webhook are supported out of the box. Each integration maps events to SMS templates.
How are inbound messages handled?+
You set keyword rules. When an inbound SMS matches STOP, HELP, or any custom phrase, the app replies with the response you configured and logs the exchange.