A2104 is a smartphone model of iPhone XS Max, which is an unlocked dual SIM phone that supports any mobile network. However, two China Telecom SIM cards cannot be used simultaneously, as the secondary card will not function properly. The phone can only use cellular data from the primary card, while the secondary card retains the functionality of voice calls and SMS. iPhone XS Max is a 2018 model available in gold, space gray, and silver. It features Apple’s largest OLED display to date, measuring 6.5 inches. This display, also known as Super Retina, has a resolution of 2688×1242 pixels and a pixel density of 458ppi. The phone still features the “notch” design on the front. iPhone XS Max has a higher level of water and dust resistance with an IP68 rating, theoretically allowing it to stay submerged at a depth of 2 meters for 30 minutes. The phone is equipped with the A12 Bionic chip, which is Apple’s most powerful chip currently in production. It has a new generation neural engine that can perform five trillion operations per second and real-time machine learning capabilities, greatly enhancing performance in areas such as photography, gaming, and augmented reality. With the new chip technology and the support of a co-processor, the phone’s battery life has been improved by 1.5 hours compared to iPhone X.