UK Electronics Repair Questions? Ask a Technician ASAP
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If the Bell 801 you are asking about is a classic telephone receiver, then you need to check whether the switch on it has disabled it, e.g. the ringer has been turned down too much, or the volume has been turned down too much to hear through the phone, etc.
After that, check all connections and re-seat them... including the connection of the handset to the base unit of the phone.