Universal in Greater China: Data coverage extends to Mainland China, Hong Kong, and Macau (partially including Taiwan), allowing for roaming in multiple locations with a single SIM card, eliminating the need for frequent card changes. 180-day extended validity: Suitable for multiple trips spanning up to six months, avoiding the hassle of frequent expiration of short-term SIM cards. 18+3G data allowance: Sufficient for daily use, with additional high-speed "3G"/regional data provided for a smoother internet experience.

China Unicom Hong Kong Greater China Data SIM (18GB + 3GB / 180 Days; includes a mobile number; unlimited high-speed data—service stops when the data allowance 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. Activation: Automatically activates 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.