Download Phoenix Wallet from the App Store for iOS users or the Google Play Store for Android users.
Open the application.
You will be presented with a Welcome screen, followed by a technical explanation of how it works, and finally a message on the importance of backing up your funds. Read it all carefully.
Select Create new wallet.
Your wallet is ready to use, however the first payment you receive must be at least 10,000 satoshis (0,0001 BTC).