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Multipath TCP (MPTCP)

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MPTCP: one connection, multiple paths

Multipath TCP (RFC 8684) extends TCP to use multiple network paths simultaneously within a single transport connection. An iPhone can use WiFi and LTE at the same time — the application sees one TCP connection, MPTCP splits the data across both links.

Apple uses MPTCP for Siri (since iOS 7) and enables it selectively for performance-sensitive apps.

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