Hi guys, A for effort, but for this kind of review I would recommend getting someone who knows the field of usability, at least consult with a usability expert, preferably someone with some experience in designing for people with diminished ability.
Two example problem areas.
Soft keys (changing function of keys depending on mode) is not a simple interface design. That goes for the Beafon, where illogical behaviour which we, the younger generation, have become used to. What I refer to is using the "call" and "hang up" keys for accessing quickmenus. This functionality will only cause confusion. As there is nothing that suggests this may be the intended function of the keys it must be considered likely that elderly users will hit these buttons by mistake and not know how to get out of the menus.
Picture this: gramps is a little senile but loves getting calls from his grandkids, you call him, he answers, you chat, you hang up. Then HE tries to hang up. Then he wants to call someone. But he's in a menu which popped up.
This is not sensible behaviour even if we are used to it.
The rubberized keys on the Binatone needed higher force, high enough that someone with arthritis would have problems? Is the stability of the rubber keys an issue for the same user?
You need help with this sort of stuff, give me a shout, we can work something out.