What is OTP Resend SMS?

An automated re-delivery of a one-time password triggered when the original OTP was not received by the user or has expired before use.

OTP Resend SMS is a critical user experience feature in any authentication system using SMS-based verification. If a user does not receive an OTP within the expected timeframe—due to network delay, SMS delivery failure, or an inbox full error—they need the ability to request a fresh OTP without restarting the authentication process. The resend flow generates a new OTP (invalidating the previous one), applies a short cooldown period (typically 30–60 seconds) to prevent abuse, and sends the new code via SMS. Some platforms implement intelligent channel switching on resend—attempting Voice OTP if SMS delivery previously failed. BhashSMS's OTP API includes built-in retry and resend logic with configurable cooldown intervals.

Frequently Asked Questions

Compliance

How long should I wait before allowing an OTP resend?

A 30–60 second cooldown between resend attempts is standard practice. This prevents SMS flooding abuse while giving the network enough time to resolve temporary delivery issues. Always invalidate the previous OTP when generating a resend.

Speed

Should OTP resend use the same number or generate a new OTP?

Best practice is to generate a fresh OTP on every resend and immediately invalidate the previous code. This prevents scenarios where a delayed original OTP arrives after the user has already requested a resend, causing confusion.

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Related Terms

Promotional SMS OTP DND Bulk SMS Sender ID SMS Gateway Priority Route TRAI 2FA

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