The information in this section of the wiki is relevant for Polkadot Vault version 6.3 and above.
Polkadot Vault is a cold storage solution, which allows you to turn your iOS or Android device into a dedicated hardware wallet for Polkadot, Kusama, and other Substrate-based chains. Your keys are kept secure (i.e. offline) at all times, and transactions are signed in an air-gapped way via QR codes.
Using Polkadot Vault in conjunction with Nova Wallet means you will use 2 mobile devices to sign transactions. It is important to note that the device which has Polkadot Vault installed on it should be
Factory Reset to remove any previous data
Disconnected from the internet
Set to airplane mode
If your Polkadot Vault Device ever connects to the internet / is tethered to a computer with internet access, you will receive a warning that your Polkadot Vault Device is no longer secure.