USA has the first three episodes available for free on its website.
http://www.usanetwork.com/mrrobot/episodes
On Medium, a user named Pneumatico Research broke down the scene exhaustively and concluded that the filmmakers had used a real spyware tool called Flexispy. The writer followed the tutorials on Flexispy's website and found that, indeed, the character had more or less genuinely hacked a real phone.
Each week this show has gotten better and better...