Checkout airgap.it You can use your old smartphone, destroy the wifi/bt chip, and use it as an offline bitcoin or ethereum vault. Install airgap wallet on your online smartphone. To sign transactions you can use qr codes. 1st to send the transaction to the offline smartphone and 2nd another qr code to transfer the signature back to the online smartphone. It does not support segwit addresses though.



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IOS Or Android Wallet With Offline Signing : Bitcoin
IOS Or Android Wallet With Offline Signing : Bitcoin
IOS Or Android Wallet With Offline Signing : Bitcoin
IOS Or Android Wallet With Offline Signing : Bitcoin

IOS Or Android Wallet With Offline Signing : Bitcoin

IOS Or Android Wallet With Offline Signing : Bitcoin