phone for senior quality

bought for my mother, not too complicated (but still a little for non techno generations ... it is I who have configured it) - convenient to use:
- Visible keys for seniors without major course for problem and grasping for arthritic fingers
- Good sound, easy to read screen
- Incoming and outgoing calls without problems
- By cons not very intuitive for SMS and MMS again for ante-generation people "geek" !!
- Strong and reliable
= to suggest for a small stretch of the keyboard, three additional hot keys would be welcome (messages, phonebook, call emergency for example)
Price too high compared to these functions, and the market