macrozheng
Dec 13, 2019 · Fundamentals
How China’s Number Portability Works: Behind the Scenes of Mobile Number Transfer
This article explains the technical foundations of China's number portability service, covering regulatory background, MDN and IMSI structures, call and SMS routing changes, the centralized portability database, and the impact on developers who previously relied on number‑prefix detection.
IMSIMDNcall routing
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