SMS Infrastructure

Send SMS for Free

Put a GSM modem in your PC, plug in a SIM card with an unlimited SMS plan, and start sending messages for as little as $7 per month. No per-message fees, no third-party markup — just direct, reliable SMS delivery at scale.

Get Started See How It Works

Typical carrier plan per SIM

1/5s

1 SMS every 5 sec per card — 720/hr · 17,280/day

∞

Scale by adding cards

24/7

Continuous operation

Setup Process

Up and Running in Three Steps

No complex infrastructure — just a modem, a SIM card, and our gateway software.

Install the GSM Modem

Connect a USB GSM modem to your PC and insert a SIM card from any carrier. Choose a plan with unlimited or bulk SMS — available for around $7/month from operators worldwide.

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Deploy the Gateway Software

Install LimitlessSoft's gateway application on the same machine. It handles communication with the modem, queues outgoing messages, and exposes a clean API for your systems to call.

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Start Sending

Connect your application or CRM to the gateway via API and begin sending SMS messages immediately. Add more modems and SIM cards at any time to increase throughput linearly.

Why SMS Gateway

Powerful, Simple, Cost-Effective

Massive Cost Savings

Send thousands of messages a month for the price of a single SIM plan. Eliminate per-message charges from commercial providers entirely.

Linear Scalability

Need more throughput? Add another modem and SIM card. Every card adds 1 message per 5 seconds — scale exactly as much as you need.

Works in Any Country

Use a local SIM card from any carrier worldwide. If unlimited SMS plans are available in your country, you can take advantage of them.

Always-On Operation

The gateway runs continuously on your machine, processing queued messages 24/7 without intervention.

Full Delivery Control

Your messages go through your hardware and your SIM card — no third-party routing, no black-box delivery reports, and no vendor lock-in.

Easy API Integration

A straightforward REST API lets any application, CRM, or automation tool send SMS messages through the gateway in minutes.

What You Need

Minimal Requirements, Maximum Output

The setup is lightweight by design. You likely already have everything you need except the modem.

Hardware

A USB GSM modem and a SIM card with a bulk or unlimited SMS plan from your local carrier.

Software

The LimitlessSoft SMS Gateway application — installed on any Windows or Linux machine.

Connectivity

A standard PC with internet access to host the gateway and serve the API to your other systems.

Ready to Cut Your SMS Costs?

Get in touch and we'll help you choose the right modem setup and carrier plan for your volume.

Let's
Build
Together.

office@limitlesssoft.com↗+381 69 369 1472↗Send Inquiry