How does the Chinese iPhone variant differ in SIM support?

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Chinese iPhone Variants Offer Dual Physical SIM Support Out of the Box

For iPhone models XR and newer purchased in mainland China, Macao, and Hong Kong, a significant difference in SIM support exists compared to variants sold elsewhere. These specific Chinese market iPhones are equipped with dual nano-SIM capabilities directly from the factory, allowing users to utilize two physical SIM cards simultaneously. This contrasts with most other iPhone models, which typically support a single physical nano-SIM alongside an eSIM.
Dual Nano-SIM Availability in Specific Markets

iPhones sold in mainland China, Macao, and Hong Kong, starting from the iPhone XR model and extending to newer devices, come with the hardware to support two physical nano-SIM cards. This feature is integrated into the device's design as a standard offering for consumers in these regions. This provides a distinct advantage for users who prefer or require the use of two separate physical SIM cards for different networks or purposes.
Standard iPhone SIM Configuration

Globally, most iPhone models, including those sold in markets outside of mainland China, Macao, and Hong Kong, offer a different SIM configuration. These devices typically feature a single physical nano-SIM slot and also support an eSIM, which is a digital SIM that can be activated remotely. While this setup also allows for dual SIM functionality, it relies on one physical card and one digital one, unlike the dual physical SIM capability found in the specified Chinese variants.
DIY Modification Demonstrates Potential

The inherent difference in SIM support was highlighted by a YouTuber, Hugh Jeffreys, who acquired a modular dual SIM tray designed for the Chinese variant of the iPhone 12. He successfully installed this component into a US model iPhone 12 5G. This modification resulted in the iPhone being able to accept two nano-SIM cards, changing the SIM settings from "Physical SIM" and "Digital SIM" to "Front SIM" and "Back SIM," and enabling the selection of a primary and secondary SIM.

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How does the Chinese iPhone variant differ in SIM support?

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