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ASUS goes dual-camera crazy for its ZenFone 4 series | Engadget
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Zenfone 4 Selfie: Asus launches Zenfone 4 Selfie smartphone series in India starting Rs 9,999 - The Economic Times
Leaker reveals images of the four devices in the Asus ZenFone 4 lineup
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Asus ZenFone 4 ZE554KL Smartphone Review - NotebookCheck.net Reviews
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ASUS Zenfone 4 Selfie Pro ZD552KL 4G Dual SIM Phone (64GB, 4GB RAM) - Red, Black, Gold GS
Asus Zenfone 4 Pro Specifications, Price Compare, Features, Review