Well it makes it less useful if your grandmother can't use it to call you.

... or if your grandmother tries to use it and loses half a million dollars.

if my nans had that kinda money she'd have an iPhone.

And still not be able to call you. (And/or still be able to lose half a million dollars.)

Do we really think women with grandchildren can’t understand Android phones?

Yeah i reckon some 80 year old grandmothers struggle with some Android functions.

I have seen real proof of this. The only reason "regular" people buy Android is to save money, but it becomes a support issue for their children and grandchildren. I've made sure my entire family is on iPhone. My mom could never figure out the bottom three buttons on Android. iOS makes more sense to her.

Counterexample: me. I'd pay double to get a phone that didn't have its on it.