Send Two-Factor Authentication SMS

Authenticate users via text messages, secure low-level transactions, and add an extra layer of security to your software
with SMS two-factor authentication (2FA).

Secure your software with 2FA

Onboard users securely and validate logins globally with two-factor authentication texts.

Generate OTPs instantly

Integrate our text message API into your software and generate SMS one-time passwords automatically.

Enable passwordless login

Link phone numbers to your users and provide them with a passwordless login experience.

Improve Security with SMS Two-factor Authentication

Verify your customers and protect against fraud with SMS 2FA.

Protect from fraud

SMS two-factor authentication adds an extra level of security and discourages hackers and fraudsters from using your system.

Usable in multiple industries

Banking services, e-commerce, software providers, apps, and medical systems all use SMS 2FA and one-time passwords.

Smartphones are not required

Only one-third of the world’s population has a smartphone. You can send SMS 2FA to any mobile device, even the older ones.

Perfect for global businesses

SMS two-factor authentication codes can be sent globally to more than 190 countries using the TextMagic API gateway.

Verify low-value transactions

SMS two-factor authentication works very well with low-value transactions and logins to ensure it is the genuine person performing the action.

Protect your business

We care about your security. Our services are encrypted with SSL, backed up 24/7, and stored in secure locations with limited physical access.

100,000+ Happy Users Since 2001

Here is how our customers have improved their businesses with our text messaging service.

SEAN Whelan

Managing Director

“I would recommend TextMagic solution to businesses who supply services like plumbers, electrician, pest control, couriers parts delivery. Anyone who supplies a service needs this solution to improve productivity.”

Read case study
Peter Harris

Managing Director

“QiQ has used TextMagic for over a year now and we love this service. It is flexible in how we send and receive messages and it is cost-effective."

Read case study
Robert Ritchie

VP of Ops & Technology

“TextMagic provided a reliable, professional and powerful way to send SMS for our urgent medical services organization."

Read case study
James Raby


“After looking into a variety of texting services we chose TextMagic because of the variety of features it offers along with the price.”

Read case study
Matthias Tomczak


“We found that TextMagic´s text messaging service is a valuable tool to increase our donation income.”

Read case study
Simon Dalrymple

Office Controller

“TextMagic allowed us to send and receive information to drivers and engineers all from one set point. It's much easier than different members of the office staff sending instructions on their mobiles and then when they leave the office we do not have a data trail.”

Read case study

How Mobile Two-factor Authentication Works

It’s easy for businesses to add an extra layer of security to their apps in the form of 2FA.

1. Make an API call

Your server makes an API call to the TextMagic endpoint and passes the destination number that should be verified with 2FA.

2. Receive a security code

The user with the destination phone number will receive a one-time verification code that will be used to complete the verification.

3. Validate the security code

A user will enter the code into a form in your app and you will pass the code to TextMagic via API. We will then send back the result.

Frequently Asked Questions

Here, you can find the most popular answers about 2FA. Haven’t found what you were looking for? Contact us now

What is included in a TextMagic free trial?

You will have full access to all features during your TextMagic free trial. No credit card details are required.

We provide you with 0.4 credit (and a dedicated number only in the USA and Canada for one month FREE). You can test the service for a maximum 30 days.

You can test sending SMS globally, as long as you have credit left.

How secure is two-factor authentication via SMS?

No security measure is perfect. SMS 2FA is no exception. Before we discuss the weaknesses of two-factor authentication, it is essential to note that the vast majority of users don’t use any security measures whatsoever. For example, 90 percent of Gmail users are not actively using 2FA.

App-based two-factor authentication is considered superior to SMS-based authentication. However, using SMS 2FA is a lot better than not using any protection at all. That’s because hackers will have to spend more time trying to bypass your systems.

What is OTP SMS, and how does it work?

A one-time password (OTP) is a mechanism through which the TextMagic API generates a single-use password that is linked to the user’s phone number. This mechanism is crucial for 2FA.

Many service providers, including Google, mobile banking systems, and payment processors, use OTP SMS to prevent identity theft and secure transactions.

How can I implement SMS two-factor authentication?

Before you can start sending 2FA SMS, you must integrate the TextMagic API with your software. Everything you need to know about the 2FA system is available in our API documentation. This includes parameters and rules for sending and checking verification codes.

How does TextMagic perform two-factor authentication via SMS?

The verification workflow is simple. Our API sends a PIN code via SMS. If there is no answer, it will follow up with voice calls. Here is the step-by-step workflow:

  • Send SMS OTP to the user. Wait 60 seconds.
  • IF the code is not provided, follow up with the first text-to-speech voice call. Wait 60 seconds.
  • IF the code is not provided, follow up with the second text-to-speech. Wait for verification.
  • The verification code can be used within five minutes of the initial request, after which it becomes invalid.

Important: users must wait five minutes for the initial code to expire before they can request a new one.

Thousands of Businesses are Already Using TextMagic

See what our customers are saying about TextMagic's business text messaging services.

View all case studies

Try our fully featured business texting platform today