Concept idealized mobile phone for seniors

In addition to this topic .
Older people need from the phone only two functions - to call and answer the call. It should be noted that when you really need to call the situation, there are quite extreme ones.
For example - the door has snowed in and it is impossible to get home, and a piece of paper with a phone as luck would have it at home. Or something else that requires an urgent call.

And here will help my concept - the phone for an elderly person. The user interface is extremely simple:

There is a screen of high contrast with auto-backlit and large letters, as the elderly are hard to read. The alternative is to display a photo of the subscriber.

Two large backlit buttons:
Green - make a call / answer a call.
Red - end the conversation.

The phone connects to the computer and a list of all subscribers that can call and what will be displayed (number / name / picture) is set there.
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When you click on the green button, the number is dialed using an autodial.

The phone itself works for a very long time without recharging, as it is very simple, it has an optional GPRS beacon that works when called.

The concept is suitable not only for the elderly but also for children. You can’t play with such a phone in the classroom, but in an emergency situation it will help you because of its simplicity - you press the button once and the phone will call your mom-dad until someone answers the call.