I have a 100% searchable tanach+Rashi+shas on my smartphone. I use it all the time. Not everyone has the luxury of being able to stay in yeshiva all day surrounded by sforim.
Not that I’m claiming to have a direct line to G-d, but if this is your entire justification for having a smartphone then I’m sure He’d rather you got rid of it. But if that’s just a side point, and entirely unrelated to your personal reasons, or indeed justifications, for having a smartphone, then kol hakovod for at least using it for a worthy cause.
A school Rebbi of mine once called in a boy about his iTouch. The boy showed him his Torah app with Shas, Shulchan Aruch and Tanach. The Rebbi told him that it was like putting a piece of matzah into a dish full of Chometz – not only does the Chometz not become Kosher LePesach, but it actually makes the Matzah chometz too.