This whitepaper explores Flash Calls as an alternative method for mobile number verification, driven primarily by rising international A2P SMS costs. It explains how Flash Calls use missed calls and caller ID data to deliver one-time passwords without user interaction, offering a frictionless experience on supported devices. The document compares Flash Calls with A2P SMS across cost, quality, security, and fraud risks. It highlights challenges such as CLI spoofing, grey routing, and voice network vulnerabilities. The paper advises MNOs to adopt balanced pricing, security controls, and omnichannel strategies to protect long-term verification revenues.

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