Smartphone shipments to China rose to a record 24m during the period, compared with 23m for the US, according to research done by Strategy Analytics.
The consultancy said shipments to China were boosted by "a wave of low-cost Android models from local Chinese brands".
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China is the world's biggest market for mobile phones with almost 952m users, and continues to grow at a fast pace.
At the same time, there has been a push by mobile phone operators to get more users to sign up for 3G services.
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