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China Unicom Hong Kong Greater China Data SIM (21GB + 3GB / 180 days; unlimited high-speed data with no throttling; service stops when data is exhausted) Valid for 180 days, starting from the day after activation until 23:59 (Hong Kong time) on the 180th day. Supported apps: WhatsApp, Telegram, TikTok, Instagram, etc. (Supports receiving verification codes for account registration). Activation: Automatic activation upon inserting the SIM card; no complex setup required. To check data usage: Dial *77850# or *11855#, or check via your phone's settings menu.