Panasonic's phone model first released in 2007 with features such as voice mail, caller ID, call waiting, call transfer and call hold. Model number: KX-TG6021M
The phone has been charged and turned on, yet the screen is completely black.
If your phone's screen is not displaying anything, your battery could be low or the screen could be broken.
For guides on how to replace your battery or screen please refer to the troubleshooting guide.