China Unicom provides support for Apple's eSIM services, indicating that the Chinese Mainland version of the iPhone 17 series will be the first to adopt eSIM technology, marking the entry of Apple phones' Chinese Mainland versions into the cardless era. eSIM is a digital SIM card built into the iPhone, eliminating the need for a physical card. It allows easy switching between SIM cards and the digital activation of new numbers, offering greater flexibility and convenience.