Now Playing: Google unveils Gmail redesign

Now Playing: Google equips school buses with WiFi

Now Playing: Google ready to take action against apps that violate safety policies

Now Playing: New high-tech solution to making phone calls

Now Playing: Google's new Duplex AI system features assistant that sounds just like a human

Now Playing: Could flying taxis soon be hitting the skies?

Now Playing: What parents should know about inappropriate content on YouTube

Now Playing: First lady launches 'BE BEST' campaign

Now Playing: Uber wants to test flying taxis

Now Playing: Facebook users seemingly unfazed by recent data breach

Now Playing: Online hackers steal images and identities for romance scams

Now Playing: InSight launch set to blast off Saturday from California

Now Playing: Could inexpensive chargers put your iPhone at risk?

Now Playing: Twitter says an internal glitch exposed all users' passwords internally

Now Playing: Cambridge Analytica is shutting down

Now Playing: Facebook reveals new features amid privacy concerns

Now Playing: New Facebook feature helps protect user data

Now Playing: Apple expected to announce slow growth

Now Playing: Two major wireless networks talk merger

Now Playing: Amazon Prime membership price jumps $20