You could install Polkadot Vault (rebranded from Parity Signer) on an outdated smartphone reset to factory defaults, which you will continue to keep in airplane manner. In this way, you could change your previous cellular phone right into a cold storage wallet. The brand primarily focuses on mushroom-infused chocolate bars, https://polkadotchocolatecompany99999.wikiannouncement.com/7460402/helping_the_others_realize_the_advantages_of_polkadot_official_shop