Youll need 2.
$200 Droid+GrapheneOS
Air gap one.
Use the 2nd droid+ Graphene phone as normal.
How do I airgap a phone?
Never thought about this.
Need to ask a friend for advice.
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This may be helpful.
https://medium.com/coinmonks/tutorial-set-up-your-own-air-gapped-wallet-for-free-with-airgap-7ef4d7b7b0cc
