Edge Wallet has emerged as one of the most popular mobile cryptocurrency wallets for crypto traders who want to trade assets and manage their portfolio on the go.
According to medium blog, Faast is one of several exchanges built into Edge Wallet. Others include ShapeShift, Changelly, etc. The way that Edge Wallet works at this time is that when you attempt to swap one asset for another within the app, it compares the rates on different exchanges.
On the blog, you can also see the step-by-step guide on how to do it
https://medium.com/faast/faast-is-now-integrated-with-edge-wallet-for-ios-and-android-e05a8193bcbfor a video on youtube
https://youtu.be/z56GQcRUW2A