Over the years I've bought many (now discontinued) BT Big Button 100 phones for the elderly and particularly the hard of hearing. These where good loud phones, wall mountable that would wake the dead.
Now BT or whoever manufactures them have changed the design to the BT Big Button 200. Ive bought more than 10 of the "Two hundreds" over a 2 year period, they are not wall mountable and most come back as faulty, one of the main complaints is they cant hear them. the volume when on loud fades after a few minutes, leaving the customer unable to hear them. This never used to happen with the BT Big Button 100 & the customers that are usually elderly do not really know whats happening. When taken to the shop and tested the sales person with perfect hearing tests then for 1 min & declares them to be fine!
They are a pile of junk that should never be inflicted on the elderly, Im never buying this phone again !