A cold wallet is a wallet that never reaches the web. I all needed are 2 old phones. One to sign transactions (the offline) and one to see may balance and receive or make payments which are only possible IF signed by my offline phone.

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true. I use an old computer to do some airgapped work. and works great for me.

I never thought of that, very interesting. would it still work if the phones are different OS?

I truly believe electrum is the best there is out there. It has so many feature including multisig wallet, 2fa wallet , standard wallet and cold wallet.

The OS is irrelevant as long as there is a version of electrum for it. For instance there is no electrum version to iphone but there is one for macos. I use an android for my offline wallet. This phone has never reached the internet since I installed electrum. And prior to install the app I did a factory reset.