It appears that large number pad cell phones are still on the drawing
board. In the meantime, a voice-activated phone may provide a
solution. The Motorola V. Series model 60c ( mentioned by
robertskelton in the comments)offers a number of helpful features
including voice-activation and a generally larger size.
Check with cellular providers in your area for information about
voice-activated phones that are compatible with their systems. Speech
impairments and background noise can interfere and they demand a lot
of battery power requiring more frequent charging depending on the
model. A nice side benefit is that you don't have to remember the
numbers - just the names.
MobilePAL, available with or without GPS Location technology, is
hearing aid compatible and has one large, button that connects the
caller with a live trained operator who has a list of contacts you
request by name. With the account password they will dial any phone
number you request. THE PHONE IS FOR OUTGOING CALLS ONLY, HOWEVER. But
surprisingly, the monthly service charge is less than a regular cell
phone. The flat per minute rate is higher than typical cell phone plan
rates but it also includes long distance, roaming, and taxes so there
are no surprises.
Search strategy: cell phone + "large number" "large keypad"
"handicapped" "visually impaired" blind, "special needs"
Google Answers Researcher