The battery could be low. Try charging the battery with the phone's accompanying unit: the Panasonic KX-T4000H.
If the phone still does not turn on, then the battery could be damaged. Order a new battery from Panasonic's website and follow the Installing Phone Battery guide to remove the damaged battery from your phone.
Note that the latch for opening the phone and extending the antenna is the same for both.
Rubber Keypad is Unresponsive
The battery might need to be charged. Charge the battery in the unit's receiver, the Panasonic KX-T4000H.
If the phone turns on but the buttons still do not work, the motherboard could be damaged. For instructions on how to access the motherboard, look through the Removing the Back Panel of the Phone guide.
Poor Reception
If you are having issues with reception, try moving closer to the receiver, the Panasonic KX-T4000H.
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