Technically flash memory storage would weigh more as a 1 (or maybe as a 0, depending), since it works by storing electrons. Apparently it stores something like 500 electrons [1]. My phone has 6 GB of storage, so if they are all ones that gives an extra weight of 2.50e-13 g, which is 0.0001 nanograms. Probably not measurable, though, especially since the large mass of the phone relative to the change in mass eliminates a lot of sensitive measurement techniques.

I'm not sure if RAM would have extra weight, as I know less about how it works.

[1] https://electronics.stackexchange.com/questions/505361/how-m...