# UPI SIM Binding — tie the session to the SIM

> SIM Binding ties a user's session to a specific SIM in a specific device. Any SIM swap, clone, or removal instantly revokes the session. NPCI-recognised for UPI 2FA in India.

## How it works
SIM Binding uses Silent Network Auth to bind the session to the SIM. The bound state is continuously valid only while that SIM is present; a swap, clone, or removal revokes it immediately — authorising payments with zero OTPs and zero fraud.

## FAQ
**What is SIM Binding?** It ties a user's session to a specific SIM in a specific device; any swap, clone, or removal instantly revokes the session.
**Is it used for UPI?** Yes — SIM Binding via SNA is recognised by NPCI for UPI 2FA in India.

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