OTP SMS Service for India
Delivered in Under 3 Seconds
ConnexBetter routes OTP SMS through dedicated transactional channels — not shared promotional queues. 99.5% delivery across Jio, Airtel, Vi, and BSNL. Automatic voice OTP fallback when SMS fails.
< 3s
Average OTP delivery
99.5%
Delivery success rate
All operators
Jio, Airtel, Vi, BSNL
24/7
Dedicated OTP routes
Where Businesses Use OTP SMS
From banking to quick commerce, OTP SMS is the backbone of digital verification in India.
User Registration
Verify phone numbers at sign-up to prevent fake accounts and bots.
Login / 2FA
Two-factor authentication for banking, fintech, and e-commerce logins.
Payment Authorisation
Confirm high-value transactions with an OTP before processing.
Password Reset
Secure account recovery via phone number verification.
KYC Verification
Verify customer identity for NBFC, lending, and insurance onboarding.
Delivery OTP
Confirm last-mile delivery with an OTP from the customer (e.g. Swiggy, Zomato model).
How OTP SMS Works
API Request
Your server calls POST /v1/otp/send with the recipient's number
OTP Generated
ConnexBetter generates a secure OTP and routes it to the carrier
SMS Delivered
OTP delivered to the user's handset in under 3 seconds
Verified
User enters OTP, you call /v1/otp/verify — done in one API call
Automatic Voice OTP Fallback
When SMS delivery fails — invalid number, network congestion, feature phone — ConnexBetter automatically dials the user and reads the OTP aloud in their preferred language (Hindi, English, Tamil, and 6 more).
- ✓ Triggered automatically after SMS failure
- ✓ Available in 9 Indian languages
- ✓ Works on feature phones without internet
- ✓ Same session ID — one verification flow
Frequently Asked Questions
How fast does ConnexBetter deliver OTP SMS in India?
ConnexBetter delivers OTP SMS to all major Indian networks — Jio, Airtel, Vi, and BSNL — in an average of 2–3 seconds. We use dedicated transactional routes that bypass DND filters and promotional queues, ensuring OTPs arrive instantly even during peak traffic.
What happens if OTP SMS delivery fails?
If an SMS OTP fails to deliver within 30 seconds, ConnexBetter can automatically trigger a Voice OTP fallback — an automated call that reads the OTP aloud. This dual-channel approach ensures 99.5%+ OTP delivery rates even for feature phones and areas with poor data connectivity.
Is OTP SMS DLT-compliant in India?
Yes. All OTP messages are sent through TRAI-registered DLT sender IDs and message templates. ConnexBetter handles DLT registration for your business and ensures every OTP SMS complies with TRAI regulations for transactional messaging.
Can I customise the OTP message?
Yes, within DLT-registered template constraints. You can include your brand name, custom instructions, and a validity period. The OTP itself (4–8 digits) is generated by ConnexBetter or supplied by your system. Example: 'Your ConnexBetter OTP is 847291. Valid for 10 minutes. Do not share it.' — CONNEXB
What is the difference between transactional and OTP SMS routes?
OTP SMS uses a dedicated high-priority route separate from even regular transactional SMS. OTP routes are optimised for sub-3-second delivery, bypass all operator queues, and are available 24/7. Regular transactional routes have slightly longer delivery windows (3–10 seconds) and are used for non-time-critical messages like order updates.
Does ConnexBetter provide OTP verification in the API?
Yes. The ConnexBetter OTP API has a two-step flow: POST /v1/otp/send (generates and delivers the OTP, returns a session ID) and POST /v1/otp/verify (validates the OTP the user entered against the session). You never store or handle the raw OTP on your server.
What OTP lengths are supported?
ConnexBetter supports 4, 5, 6, and 8-digit OTPs. 6 digits is the default and most widely used. You can configure OTP length, expiry (1–30 minutes), and the number of allowed retry attempts in your dashboard.
Start delivering OTPs in under 3 seconds
Join 500+ businesses using ConnexBetter for OTP delivery. DLT-compliant, API-ready, with dedicated support.