I have the above mentioned telephone receiver which had its "Dial" Locked and the user even forgot the password they used to lock so we cannot unlock the Dial.The question is :How do I unlock this phone so that we can sue it once again to make calls?
I have tried to look for a CMOS battery inside both the handset and the base but cannot locate it if is available.please help.

Did you try calling Panasonic customer service. I have an older Panasonic cordless system and had a problem that their tech support solved for me.