You may have a second phone number , you don’t have a second phone line , have you tried calling it from your mobile while at home , does your landline ring , what tone does the caller receive if they call that 0331 number but your phone at home doesn’t ring , is it no tone , number unobtainable tone , busy tone , or ringtone but the home phone doesn’t actually ‘ring’ ?.
Are you on Digital Voice already , still on PSTN ( so your phone is not connected to the BT router its still in the wall socket ) , have you been advised that you will be migrated to DV ‘ soon ‘ , or have you made any enquiries with other providers about your broadband or telephone service ?
Its irrelevant now , but many years ago ( decades ago) , I had two numbers with my broadband, the geographical number ( with a STD code associated with my town/city ) and an ‘internet’ number that was not geographically allocated, calls on this internet number were cheaper than the regular number , and you could switch between the two with a service specific BT handset ….but it’s unlikely to be anything like that , it was discontinued many years ago .
