From Bethesda:
Download Fallout C.H.A.T - the official Vault-Tec Communications Hub And Transmitter - for all of your Vault-Tec communication needs. Jazz up your messages with a custom keyboard, over 60 Fallout emojis, and animated Vault Boy GIFs.
Fallout C.H.A.T is available worldwide for free on iPhone, iPad and Android devices. Visit the App Store or Google Play to start chatting today.
Happy texting!