Conclusion
Overall, the Panasonic X400 was tailored for early mobile adopters seeking a straightforward, reliable device with essential communication functionalities. While it lacked the advanced features we see in modern smartphones, its compact design, customizable caller ID LED, and convenient auto-open mechanism made it a practical choice back in its time. The phone's straightforward interface, coupled with durable battery life, underscored Panasonic's focus on creating efficient communication devices.