There's a whole community of older potential users who can't get the hang of cell phones. Voice prompts and encouragement would open access to your product for a growing senior section of the population.
It would require some intensive training and hopefully they would not be like my 86 yr. old Mum. She has trouble figuring out which part goes on her ear and frequently has a shouting match with whomever called and that's on a corded phone. Cellphone........Nah.