Sim Tray, manufactured by FOCUS, offers a durable and reliable solution for securely holding and accessing your SIM card on your electronic devices. Sim card tray is an indispensable component in mobile communication devices. Its main features are as follows: First, the Sim Tray has a small and portable design, which is easy for users to plug and unplug and transfer between different devices. Secondly, it stores the user's identity information, including the International Mobile Subscriber Identity (IMSI) and encryption keys, ensuring the security of communication. The SIM card also has a certain storage capacity, which can save contact information, text messages and other data. Although the capacity is limited, it is sufficient for basic data storage needs. In addition, the sim slot supports multiple network standards, such as GSM, CDMA, 4G LTE and 5G, and can adapt to the network environment in different regions. It is also highly programmable, and operators can remotely configure and manage the Sim Tray through over-the-air download technology (OTA). Finally, the Sim Tray has good compatibility and can be used on a variety of mobile devices, from traditional feature phones to modern smartphones.