The Giffgaff (GG) UK official physical SIM card is a prepaid UK phone card that requires no registration and supports global roaming. Due to its low retention cost, it is ideal for: Overseas platform registrants: Those who need a physical UK mobile number to register for overseas applications such as ChatGPT, Claude, and PayPal, avoiding virtual number restrictions. Cross-border e-commerce professionals: Foreign trade personnel, TikTok operators, or entrepreneurs going global, who need to securely and reliably receive international verification codes and overseas SMS messages. Users seeking low-cost backup: Users prioritizing extremely low costs. Simply send one SMS every six months (approximately 30 pence) to retain the number long-term. International students and short-term tourists: Suitable for activation in their home country before traveling to the UK, allowing for immediate calls and internet access upon arrival, avoiding roaming charges.

Initial balance: £0 (requires a minimum £10 top-up; includes a random bonus of £5). Monthly fee: None (pay-as-you-go). Top-up method: Supports bank cards (VISA or MasterCard). Low-cost number retention: The number remains active as long as there is a change in the balance at least once every six months. No monthly fee: Suitable for long-term number retention and receiving SMS verification codes. No passport requirement: The carrier does not mandate real-name registration, making it accessible even without a passport. Roaming rates in Mainland China: Receiving SMS: Free Sending SMS: £0.30/message Making calls: £1.00/minute Receiving calls: £1.00/minute Data: £0.20/MB How to obtain a mobile number: Randomly assigned by the carrier upon activation; each user has two opportunities to change the number. Additional information: Mobile data usage warning: Please disable mobile data when using the service in China to avoid high data charges.