But yeah, in this case, there are big-button landline phones with speed dial.
In this particular case, we've tried a big button phone. The problems with it are two fold: first, cataracts impact her straight forward vision and she's not able to remember button placement. Second, it's not uncommon for her to forget what she intended to do before getting there. The simple act of walking to the phone to initiate a call is enough time for her to forget who she wanted to call in the first place. At least in this case, she can act on the thought immediately and be reminded when she gets to the ringing phone.
[^1]: full disclosure: I can toggle my lights with my Echo. I use z-wave light switches though so people that aren't nerds like me don't have to personify the appliances in my apartment.