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Bulk SMSReliable business messaging at scale.
WhatsApp Business APITwo-way conversations on the app customers use most.
RCS Business MessagingRich, interactive customer experiences.
VoiceConnect with customers through voice.
Email MarketingEngage customers through personalized email.
All ServicesCompare all five channels side by side.
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OTP & Authentication
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Authentication

Verify customers quickly without adding friction.

A verification code that arrives late causes abandoned sign-ups, failed payments and support calls. Authentication needs a fast, dependable route.

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Verify customers quickly without adding friction.

Recommended channels

SMS Primary

Bulk SMS

Prioritised OTP delivery on any phone.

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Voice

Spoken OTP fallback when SMS is not received.

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Email

Email Marketing

Verification links and security notices.

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Example use cases

  • Login and sign-up OTPs
  • Transaction verification
  • Password reset and security alerts
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Industries that use this

Banking & FinanceE-commerceHealthcare

Related use cases

OTP & AuthenticationOrder NotificationsTransaction AlertsPromotional Campaigns

Other solutions

Customer EngagementTransactional CommunicationMarketing Communication

Authentication questions, answered.

Clear answers to the questions we hear most. If yours is not here, ask us directly.

What happens if a customer doesn't receive the SMS OTP?

A voice OTP fallback can be triggered automatically after a short delay, so the customer is not stuck waiting on a single channel.

Is email verification as fast as SMS OTP?

Email is usually slower and better suited to account-recovery or lower-urgency verification, while SMS remains the fastest option for time-sensitive logins and payments.

Ask Our Team

Ready to make every message count?

Tell us what you are trying to achieve. We will help you choose the right mix of SMS, WhatsApp, RCS, Voice and Email and get you started.

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