Parity Signer is a cold storage mobile application, allowing smartphones to be used as off-line wallets. To sign a transaction, a user should disconnect their smartphone off all the networks. 

Funds are transferred from and to Ethereum and Kusama accounts without a device being connected to any network. These payments are signed. The app is available both with AppStore and Google Play. Private keys are generated by a user. The supported networks include Ethereum, Ethereum Classic, as well as testnets Kovan and Ropsten.

Therefore, it’s recommended to have a special-purpose mobile device so that it could be used as a cold storage off-line wallet.

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