Ken has been thinking about getting his mother an iPhone, but Leo thinks the iPhone may be too complicated for elderly parents. Leo got his mother the Jitterbug, and she loves it. It has big buttons, emergency urgent response buttons, and features that help older callers. In Canada, there's the Doro phone, which is recommended by AARP. Members can get the Doro for $10 a month.
Ken was also thinking of an Android phone, but Leo says Android is more of a tinkering OS. The Lumia 900 Windows Phone 7 may be a better option.