In case people don't know, modern smartphones didn't exist until 2010, or at least didn't become mainstream until that year, so even Ai wouldn't know what it is or how to use it.

game2009 said:

In case people don't know, modern smartphones didn't exist until 2010, or at least didn't become mainstream until that year, so even Ai wouldn't know what it is or how to use it.

iPhone was debuted in 2007

TruongJayhawk2112 said:

iPhone was debuted in 2007

To put a finer point on it, the first iPhone sold in Japan was the iPhone 3G, released just 1 month before Ai's death (the original one was not sold due to a technical limitation.)
Anyway, the conclusion remains that there is almost no way she could have known.