One option is Ledger but it's properiety so I wonder how can I trust it
Don't use a hardware wallet. It's not adding much and the quality of them is so low that it actually is worse. I'd you must, store your wallet file on a USB key
USB key such as yubikey and such these?
Use a second phone that doesn't connect to the Internet. For BCH you can use electron cash and sign transactions using QR codes so your phone never goes online. For BTC and ETH you can use AirGap Vault.
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