Infinito Wallet is a secure mobile wallet for Android and iOS. It features the ability to store most of the popular currencies. Setting it up is easy and it uses HD (Hierarchical Deterministic) passphrase to get started. Once you've gone through the setup process, you should see a screen like below:
Ignore the "Free Registration" for EOS as that has now passed. Click the "CLAIM AIRDROP NOW" button and you'll see this:
Congratulations, you are now registered to receive the PASS airdrop!
For more information on Blockpass, click here: https://blockpass.org/
Infinito Wallet is available for iOS and Android from their respective app stores.