The Prosper Wallet mobile app is currently distributed through Apple TestFlight.
Step 1 - Install TestFlight
Download TestFlight from Apple:
https://testflight.apple.com/join/T94aqP38
Step 2 - Install Prosper Wallet
After installing TestFlight, open the link again:
https://testflight.apple.com/join/T94aqP38
Follow the prompts to install the wallet.
Step 3 - Import Your Wallet
Open the app
Select Import Wallet
Enter your 12-word seed phrase
Create your wallet passcode
Create your transaction PIN
You now have full wallet access.