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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. 
 true. having an old smart phone with electrum on it would be the best hardware wallet you can have. 

an old laptop would work too 😉 haha. airgapped laptop with electrum on it. I wouldnt think its uncommon amongst OG bitcoiners...