This idea is very very simple and cheap. Why not combine the best from stationary phones and mobile phones and create a product suited for the elderly? With a SIM card plugged in a stationary phone you can place it anywhere there is a power outlet. The phone can be made large with large buttons and there is no battery that needs to be charged. The connection is wireless and you pay a monthly fee. I believe this solves the telephone problem for a lot of older people. I mean they usually don’t carry the phone with them. They have other problems like less ability in the hands, less eye vision and hearing.