Products

CHANNELS

SMS

Send text messages worldwide via API or web platform.

Viber

Deliver rich, branded messages with media through API or intuitive web tools, with failover support.

AUTHENTICATION

HLR & MNP Lookup

Real-time network and number checks for precise delivery.

Verify API

Enable multi-factor authentication on any channel, with fallback options.
Features
Features

Shortlink Tracking

Shortcodes

Team Management

Optout/Optin
Pricing
Resources
Bulk SMS

SMS Marketing

SMS Gateway

SMS Affiliate Program

Blog

SDKs

FAQ

Unicode SMS Checker
Contact Sales

Log In

SMS.to Blog

What Is a Text Message API? How It Works, With Code

A text message API lets your software send SMS with a single HTTP request. Here

Free SMS API for Developers: What’s Really Free (and What Isn’t)

Most "free SMS APIs" are free to try, not free to run. This guide explains

What Does “Invalid Number” Mean in SMS Delivery Reports?

"Invalid number" means an SMS could never reach the destination as addressed. Here are the

SMS Glossary: 28 Messaging Terms Explained (SMPP, DLR, HLR…)

SMPP stands for Short Message Peer-to-Peer. This glossary defines 28 SMS terms, from delivery reports

Firmao: Streamlining Business with CRM, Tasks, and Invoicing

Firmao is a cloud-based, all-in-one business system covering CRM, invoicing and tasks. Here is what

SMS Marketing: A Practical Guide to Getting Started

A step-by-step guide to SMS marketing: getting consent, choosing a sender ID, writing and personalising