There are basic phones available from Verizon Wireless that might fit your needs. You can also look at the Samsung phones as they have two versions of the UI (user interface), a standard version and a basic/simple version. The basic UI version might work as well and still allow someone who is more tech savvy to adjust the settings in the standard UI version to get the experience customized to the end user.
I'm most definitely NOT a VZW employee. If a post answered your question, please mark it as the answer.