Press [MENU] → “Initial Setting” → “Reset” → Enter PIN code 0000 (default) or 1111 . This deregisters the handset and clears your phonebook. It does not reset the base unit.
A: Mostly yes, but the manual specifies DECT 6.0 bases. It works with KX-TG4000 series and newer. It will not work with old 2.4 GHz or 5.8 GHz Panasonic phones. Panasonic Cordless Phones Manual Pnlc1023
You don't need a landline provider feature to block numbers. Press [MENU] → “Initial Setting” → “Reset” →
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