2Factor is Bulk SMS & OTP service provider which provides reliable messaging API and direct connectivity with TIER-1 Telcos. They have proprietary routing algorithm to re-route failed messages via backup operators. They only charge you for the OTPs that are delivered within 15 seconds & in first attempt via primary operator.
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[Disclaimer: I work for 2Factor SMS Gateway Provider thus below answer may involve references to 2Factor’s offerings]Hello,In India, there are primarily two categories of messages ( as approved by TRAI, Telecom RegulatoryTwo Factor Authentication