No. Cold wallets are just keys to the blockchain which is always online
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You'd be surprised how many Bitcoin experts here think their coins are actually on their phone or laptop.
I have a spare smartphone that runs on Android 9.
Will it be safe to store Bitcoins on it by following the below steps:
Format the phone
Install nothing but a Self-Custodial Bitcoin wallet app on the phone
Transfer Bitcoins to the wallet
Turn off the internet
Keep the phone switched off until needed.
No. Cold wallets are just keys to the blockchain which is always online
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You'd be surprised how many Bitcoin experts here think their coins are actually on their phone or laptop.
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Smartphone apps are not suited for this purpose.
You can:
Better and cheaper version would be to install Tails OS on a usb key and store bitcoins there using electrum wallet.