Breez is a Lightning Network client which makes paying in bitcoin a seamless experience. With Breez, anyone can send or receive small payments in bitcoin. It's simple, fast and safe. Breez is a non-custodial service that uses lnd and Neutrino under the hood. 
Breez also includes a Point-of-Sale mode which transforms the app from a Lightning wallet into a Lightning cash register with the slide of a finger, allowing everyone to become a merchant and accept Lightning payments.
For more technical information, please go to: https://github.com/breez/breezmobile. 

Warning: the app is still in beta and there is a chance your money will be lost. Use this app only if you are willing to take this risk.