WhatsApp. RCS. AI Voice.


Enterprise SMS API for transactional alerts, promotional campaigns, and bulk messaging — backed by direct MNO connections across 104+ operator networks. One REST API for every SMS use case, from single OTP to multi-million message broadcasts.
- SMS OTP API — no Sender ID registration, global reach
- WhatsApp OTP — higher open rates, verified delivery
- Fallback OTP — SMS → WhatsApp auto-retry on failure
- Two-factor authentication API, REST, per-country pricing
Enterprise SMS API for transactional alerts, promotional campaigns, and bulk messaging — backed by direct MNO connections across 104+ operator networks. One REST API for every SMS use case, from single OTP to multi-million message broadcasts.
- Transactional SMS API — order alerts, notifications, receipts
- Bulk SMS API — A2P broadcast at enterprise scale
- Promotional SMS — marketing campaigns and re-engagement
- SMS gateway, 2-way messaging, delivery analytics
WhatsApp Business API for enterprise-scale messaging — utility notifications, authentication OTP, marketing broadcasts, and two-way customer conversations. Meta-compliant BSP access with rich media, interactive templates, and verified sender identity.
- WhatsApp Business API — utility, auth, marketing templates
- Rich media — images, documents, videos, list messages
- Interactive templates — buttons, quick replies, CTAs
- Two-way messaging and conversation flows
RCS business messaging for Android (and now iOS) — branded rich messages with carousels, action buttons, and read receipts delivered inside the native messaging app. Higher engagement than SMS. Automatic SMS fallback where RCS is not yet supported.
- RCS messaging API — rich cards, carousels, action buttons
- Verified business sender — branded identity, no spoofing
- Read receipts, delivery confirmation, engagement analytics
- Automatic SMS fallback for full device coverage
AI voice agent that answers every inbound business call 24/7 — holding natural conversations, booking appointments, and capturing leads automatically. 74% of business calls go unanswered. Voice Now closes that gap without adding headcount. Developer API available.
- AI phone answering — 24/7 inbound call handling
- Natural language conversations — not IVR press-1 menus
- Appointment booking, lead capture, FAQ handling
- Voice AI API — developer-friendly, integrates with CRM
AI-powered eKYC for fast, secure customer onboarding. Deepfake-proof and RBI-compliant, built for regulated enterprises in India needing reliable identity verification at scale.
- AI-powered identity verification — deepfake-proof
- RBI-compliant for Indian regulated enterprises
- Fast onboarding — minutes, not days
- API and dashboard access
Phone-to-App (P2A) authentication messaging — validates the user's device and phone number as part of an app login or transaction flow, without requiring the user to type an OTP. Works alongside u2opia's SilentAuth+ network authentication layer for the most complete mobile identity stack available.


When SMS OTP delivery fails — due to carrier filtering, congestion, or user preference — Verify Now automatically retries via WhatsApp. Every verification attempt has a fallback path. You stop losing users to silent OTP failures that kill conversion at the most critical step.
How can businesses use SMS APIs to improve customer experience?
SMS APIs enable businesses to send real-time notifications, alerts, OTP authentication codes, appointment reminders, and transactional messages directly to customers. By integrating an SMS API into customer journeys, businesses can improve engagement, reduce response times, and deliver timely communication across every stage of the customer lifecycle.
What is the role of OTP authentication in customer experience?
OTP authentication helps businesses verify user identities during signup, login, password recovery, and transaction approvals. By combining secure OTP authentication with seamless onboarding workflows, businesses can improve account security, reduce fraud, and create a trusted customer experience without adding unnecessary friction.
Why are businesses adopting WhatsApp Business APIs for customer engagement?
The WhatsApp Business API allows businesses to engage customers on one of the world's most widely used messaging platforms. Companies use WhatsApp APIs for customer support, notifications, order updates, authentication, and conversational commerce, helping improve response rates and create more personalized customer interactions.
Why are businesses adopting WhatsApp Business APIs for customer engagement?
The WhatsApp Business API allows businesses to engage customers on one of the world's most widely used messaging platforms. Companies use WhatsApp APIs for customer support, notifications, order updates, authentication, and conversational commerce, helping improve response rates and create more personalized customer interactions.
How can Voice AI enhance customer experience?
Voice AI helps businesses automate customer interactions through intelligent voice assistants, AI-powered call handling, appointment scheduling, customer support, and lead qualification. By integrating Voice AI with SMS, WhatsApp, and other communication channels, businesses can provide faster responses and deliver seamless omnichannel customer experiences.
Which communication channels should businesses use for customer engagement?
The most effective customer engagement strategies combine SMS APIs, WhatsApp Business APIs, RCS messaging, Voice AI, email, and other digital channels to reach customers on their preferred platforms. An omnichannel customer experience platform helps businesses manage these channels from a single interface, creating consistent and personalized customer journeys.
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