The Black Tea Assistant is a functional app independently developed by Black Tea Mobile. It can quickly detect whether your phone supports eSIM and quickly open the eSIM function. At the same time, it can also help you to query and detect the device information and SIM card information of your mobile phone. In addition, the black tea assistant also has the functions of ordinary speed measurement and advanced speed measurement. It can fully understand the current network speed, network delay, network performance and other network conditions.