If you practice good OPSEC, you can use any wallet. A PC that you do not use for ANYTHING ELSE is the best option. Phones are too easily comprised and should only be used for two factor authentication purposes. Hardware wallets are nice because they provide a layer of security that a phone or PC cannot easily match.
Air gapped would be ideal. Or at least a PC you do not put on the Internet. For your cold storage. You have to move stuff online to trade, obviously.
Hence the emphasis on only using the PC for transactions and nothing else. Don't network it with other PCs. A 4G hotspot would be beneficial for keeping it off any shared network.
Yeah I hadn't thought of that but 4G is encrypted and is probably reasonably more secure than your home Internet
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