The integrated communication map of heaven and earth is further expanding. Recently, China Telecom officially launched its mobile direct satellite service in Hong Kong. No need to change cards or numbers, even without ground signal, users can make phone calls and send text messages. The relevant person in charge of China Telecom stated that the technical verification and network testing of the mobile direct satellite service in Hong Kong have been completed, and with the support of the Hong Kong SAR government, the operation license has been obtained. The mobile direct satellite service has successfully landed in Hong Kong. Direct connection of mobile phones to satellites allows citizens to make and receive satellite calls smoothly even without ground network signals, and edit satellite messages. This business can provide a more reliable communication method for special scenarios such as emergency relief, mountaineering exploration, maritime communication, and field operations. Telecom users do not need to change cards or numbers, they only need to activate the direct satellite connection function on their mobile phones or order satellite communication packages to enjoy this service. Behind the direct connection of mobile phones to satellite services, it is inseparable from the support of the "behind the scenes hero" Tiantong-1 mobile communication satellite. The Tiantong Satellite System is China's first independently developed and applied satellite mobile communication system, which realizes voice calls, SMS sending, data transmission, and related value-added services through a satellite dedicated network. It has the characteristics of independent control, security and confidentiality, wide coverage, and all-weather communication. Satellite communication is also becoming the primary battlefield targeted by major mobile phone manufacturers. In 2023, Huawei upgraded satellite communication to satellite communication. In 2024, a series of mobile phone brands such as OPPO, Honor, Meizu, and Xiaomi closely followed Huawei's footsteps, spreading news of deploying satellite communication. The "satellite war" has quietly begun among domestic mobile phone manufacturers. (Lai Xin She)