Suitable for: * **Cross-border business travelers:** Those who frequently travel between Mainland China, Hong Kong, Macau, and Taiwan for business and require immediate internet access upon arrival without needing to change SIM cards or purchase multiple local plans. * **Travel enthusiasts:** Those planning multi-stop trips (e.g., Hong Kong combined with Shenzhen, Macau, or Taiwan) can use a single universal SIM card to meet their internet needs throughout the trip, avoiding multiple queues for SIM card applications. * **Cross-border commuters/workers:** Those whose workplace is in Hong Kong or Shenzhen but need to travel between the two cities daily can benefit from this type of card, which provides seamless cross-border internet access. * **Visitors valuing internet freedom:** Some Greater China roaming SIM cards support direct access to overseas websites and social media platforms when used in Mainland China, providing convenience for foreign tourists, business travelers, or users with specific needs in Mainland China.

Hong Kong Unicom Greater China Data SIM Card 38GB/180 Days with Number (Unlimited Speed, Unlimited Use, Discontinued After Usage) This card is valid from the day after activation until 23:59 Hong Kong time on the 180th day (a total of 180 days). Supported Applications: WhatsApp, Telegram, TikTok, Instagram, etc. Activation Method: Automatic activation upon insertion, no complicated operation required. Check Data Usage: Dial 77850# or 11855# or check via your phone's settings menu.