Secure user logins globally with Infobip’s SMS OTP service

Authenticate users instantly with the world’s most reliable SMS OTP verification API. Easily reach mobile users globally through Infobip’s 800+ direct telco connections.

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POWERING CRITICAL COMMUNICATIONS FOR GLOBAL BRANDS

Why brands trust Infobip for authentication via SMS

Every day, our SMS OTP platform helps protect millions of user logins all around the world. With high delivery rates and proven reliability, we help brands keep accounts safe and make sure users can always get access when they need it.

Unrivaled delivery rates

Don’t let lost codes hurt your conversions. Our network of direct connections ensures messages arrive in seconds, not minutes.

Bank-grade security

Fully compliant with GDPR, ISO 27001, and SOC 2. We mitigate fraud with short expiry times and rate limiting.

Global reach, local feel

Send OTPs to any mobile number, using local branded sender IDs your users trust and recognize instantly.

Built for developers, scaled for enterprises

Smart fallback logic: If one channel fails, automatically retry via others. Ensure 100% verification success.
Real-time analytics: Monitor delivery speeds and conversion rates instantly.
Flexible configuration: Customize code length, expiry time, and retry limits.

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More about our SMS API

OkHttpClient client = new OkHttpClient().newBuilder() .build(); MediaType mediaType = MediaType.parse("application/json"); RequestBody body = RequestBody.create(mediaType, "{\"applicationId\":\"1234567\",\"messageId\":\"7654321\",\"from\":\"Sender 1\",\"to\":\"41793026727\",\"placeholders\":{\"firstName\":\"John\"}}"); Request request = new Request.Builder() .url("https://{baseUrl}/2fa/2/pin?ncNeeded=true") .method("POST", body) .addHeader("Authorization", "{authorization}") .addHeader("Content-Type", "application/json") .addHeader("Accept", "application/json") .build(); Response response = client.newCall(request).execute();

Customer stories

From fintech to entertainment, brands across the globe trust Infobip platform to secure their user experience.

Spoon Radio: 80% reduction in subscriber sign-up churn with an optimized 2FA Authentication solution from Infobip .

80%
reduction in subscriber churn .

Bukalapak: Increasing client account security with two-factor authentication .

4-5%
increase in delivery rates .

Yousign: Increasing SMS delivery rates to authenticate signers .

97%
delivery rates .

Kakao: Increasing new user conversion rate to more than 90% with reliable one-time PIN delivery .

90%
increase in new-user conversion rate .

We are very satisfied with Infobip’s delivery rates that are over 97%, and that is why they are our main provider of SMS solution for one-time pin delivery. OTP delivery is a crucial part of our business and because of high delivery rates and technical support we value our cooperation with the company very much.

Romain Pichard

Product Owner, Yousign

Verify users via SMS in 4 simple steps

Sign-in screen with fields for username and password, offering options to sign in, including receiving a verification code.

1. TRIGGER

User request

User triggers the process by requesting a login or verifying a transaction on your website or app.

Text message stating: 'Your one-time PIN code is 635606. Please type this code in your app to complete the verification.

2. GENERATE

Code generation

The API call generates a secure, randomized, time-sensitive code sent to the user.

Screen prompting to enter a 6-digit code received via SMS, with the code '635606' entered and a 'Verify' button below.

3. DELIVER

Message delivery

Infobip routes the SMS with the generated code via the fastest direct path to the user.

Screen displaying a checkmark with the word 'Verified', indicating successful verification.

4. VERIFY

User verification

User gets access to your platform after entering the code.

Examples of SMS OTP use cases

Text message stating: 'Your OTP for accessing the emergency response system is 123456. Please use this code within 5 minutes to ensure secure access.

Public services

Authenticating personnel accessing critical systems (e.g. police and fire departments or emergency response teams).

Text message displaying: 'Your OTP for verifying package handling is 654321. Enter this code to confirm your identity and proceed with the delivery.

Delivery services

Verifying personnel and ensuring secure package handling.

Text message stating: 'Your OTP for accessing the student portal is 789012. Use this code within 10 minutes to secure your login and access academic resources.

Educational institutions

Securing access to student portals, course registrations, and academic resources.

Text message stating: 'Your OTP for confirming your booking change is 345678. Please enter this code to complete your reservation update securely.

Hotels and airlines

Enhancing security during online bookings, reservation changes, and loyalty program interactions.

Why SMS OTP remains the standard

Use SMS for maximum reach, and layer other channels for cost optimization.

	SMS OTP	Email OTP	WhatsApp OTP
Reach	100% (any phone)	High	Only app users
Speed	Instant	Slower (due to spam filtering)	Fast (if internet connection stable)
Internet connection required?	No	Yes	Yes
Best for	Primary two-factor authentication	Backup 2FA	Cost savings (with fallback)

Expand your messaging channel mix – maximize conversions, minimize costs

Send time-sensitive OTP messages on the most cost-effective channel for each recipient, with failover safeguards that never let you down.

Explore Smart Messaging

Flowchart illustrating the messaging process: sending a message, optimizing channel mix, checking delivery status, and using automatic failover channels to ensure message delivery across multiple apps.

Recognized for reliability, security, and reach

Our OTP SMS service received widespread recognition within the industry, being awarded for its reliability, security, and global reach. As a trusted provider, these awards reinforce our devotion to providing top-tier security solutions that businesses can rely on.

ISO 9001 Certified

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ISO 22301 Certified

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SOC 2 Type 2 compliant

Mobile Ecosystem Forum certified

How to choose an SMS OTP provider

Choosing the right SMS OTP provider is crucial for ensuring security and reliability of the authentication process. Let’s explore the key criteria you should consider before deciding:

Deliverability and speed

Look for providers that offer guarantees in delivering SMS messages promptly to customers. Delays in OTP delivery can impact user experience and security.

Security features

Evaluate the encryption methods used by the provider. Strong encryption ensures that OTPs remain confidential during transmission. Consider data protection mechanisms, such as secure storage of phone numbers and OTPs. Ensure the provider complies with relevant regulations (e.g., GDPR, CCPA) to safeguard user privacy.

Integration

Assess how easily the SMS OTP solution integrates with your existing systems. A seamless integration process minimizes disruptions and saves time. Check if the provider offers APIs or SDKs for smooth implementation.

Pricing

Compare costs among different providers, considering initial setup fees and ongoing charges. However, note that a lower price might mean lower-quality SMS routes, which could lead to OTPs not being delivered. Scalability is essential—ensure the pricing model aligns with your expected growth.