Download Breadwallet from the App store: BreadWallet on App Store.
Open Breadwallet.
Tap on "new wallet".
Tap "generate recovery phrase".
Write down your recovery phrase if you have the chance, or Tap "remind me later" and do it as soon as you can.
Tap "scan QR code". Allow breadwallet to access your device's camera.
Scan the QR code on the paper. Look for the "private key".
Tap on the amount offered by the popup.
You're done! You're now ready to spend your Bitcoins!

Download Mycelium Wallet from Google Play Store: Mycelium on Google Play Store.
Open Mycelium.
Tap on "Create New".
Tap on the "Balance" tab.
Tap on the camera icon on the middle of the screen (between the "Send" and "Receive" buttons).
Scan the QR code on the paper. Look for the "private key".
Tap "Send".
Tap "My Addresses" then choose "Account 1".
Tap on the "Enter Amount" icon and tap "Max" then "OK".
Tap "Send".
You're done! You're now ready to spend your Bitcoins!

Sell Bitcoin for Euro (BTC → EUR)