You don't necessarily need a 100% secure phone especially if you don't plan on trading BTC. All you need is to buy coins from an exchange and then move your coins to a cold storage wallet such as TREZOR. Done. No one can take your coins if you are good at securing your TREZOR. BTC is a great store of value and inflation insurance nut if you wait too long you will miss the boat.
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Yes I know about Trezor but don't you need a cell phone to use it?
Nope. Not at all.