a stock Android phone to tweet, it's a safe assumption that it's compromised and bugged. I do some Android development work on the side and with Android's lax security it would be incredibly easy to turn that phone into a listening device. I have no doubt Russia has compromised it by now.
https://www.npr.org/sections/alltechconsidered/2017/02/03/513256171/is-trump-tweeting-from-a-secure-smartphone-the-white-house-wont-say