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China Mobile to expand Wi-Fi

China is expected to expand Wi-Fi service in '13 as China Mobile (CHL) — the world's biggest mobile carrier by subscribers — and other carriers aim to offload data traffic from 3G wireless networks. China lags developed nations in free public wireless local area networks. China Mobile says it will add 1.4 mil Wi-Fi points in China, bringing its total to 3.78 mil. Shares rose 1%.