A wall mounted one without convenient surface nearby to put the handset on could helpGreat suggestions above...
Another thought is to go retro! You can buy old style telephones with either a dial or push buttons and the old curly wire attaching the receiver to the big bit. Perhaps the curly wire would stir enough old memories that he'd put the receiver back properly?
Either something like >>>this<<< or a >>>retro one<<< with cradle and either dial or push button.
Dial type may not work with BT Digital Voice without a pulse to tone convertor, e.g. >>>this<<<, other VoIP ATAs (analogue telephone adaptor) may work.
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