I have always found it curious as to why Nokia is held up as the leader in UI for the mobile phone market. Having had to help numerous less tech savvy folks with thier basic Nokia phones I have found thier use of a single modal action button, inconsistant back buttons, deep menus, no ability to see the list of options etc. to be less than user friendly. I personally consider Nokia to only be one step better than Motorola in thier interfaces.
Sanyo, Sony and the other consumer electronics companies are way better overall in thier ability to simply enable the user to move through the phone.