Christ @chesirecat99, I'm sorry I offended you and yours but seriously? 
You could take 10 of my cleaning clients and put them in the OPs mothers position.
Some would have a smart phone.
Some would not.
Some wouldn't know what a smart phone was.
Some would have one and only know how to call and text.
Another could probably take it apart and put it back together again in full working order.
Another prefers the landline, but just likes to use the smartphone for candy crush.
Etc etc
When it comes to tech, there is such a wide spectrum of abilities and interest, especially among the older age groups. A lot of it has to do with how integrated they are with the younger generations in their family. I.e. spend a lot of time with grandchildren, get familiar with iPads, selfies, and face timing.
It's not ability due to age, its familiarity due to circumstance.
I asked the question (however affronted you may be by my phrasing) BECAUSE it's the one generation where knowledge and experience of tech is so varied, and whilst they may have a smartphone, they may not be able to/have used all the features its capable of.