Yeah, using your 12 or 24 words you saved elsewhere safely. First create a new wallet having a new set of 12/24 words and select an address to receive coins. Then restore the original wallet with your saved words and transfer you coins to the selected new address. Now your coins are safe in the new address and the new set of words are the ones you have to keep safe.

Interesting, I’ll check it out. I see the flapak release, will you make it available from flathub?

There are a couple of things you can do:

1. Hide the app from the app drawer. To open the app you have to go to settings and look for the complete app listing which include system apps. Search how to hide an app for your particular android version.
2. Connect the phone to the computer and install the wallet as a system app using adb. Being a system appt you can disable it from the app’s context menu and the app will not be visible. To open it you have to enable it from the settings.

In both cases is extremely improbable that someone that grabs it will start to look for hidden or disabled apps in an old and seemingly discarded phone. That’s why nobody has to know that you save your keys in this way. Just grab an old phone, the older, cheaper and unatractive the better. Nature teaches us that disguise is the best way to hide. And in case is stolen, you have a good amount of time to move your coins to another wallet.

What you really need is an air gapped or cold storage and you can achieve this in many ways. I found that one of the best ways to do it is grabbing an old phone and following this guide. TLDR: install the software wallet and never connect the phone to the internet again and use QR codes to sign transactions using the camera. Practical, cheap, truly air gapped and doesn’t attract attention like a hardware wallet.

Posteo has an anonymized payment system, so you could pay with credit card and your payment information won’t be linked to your account.

I moved to Linux, use Freetube, LineageOS on the phone, listen all day to internet radios from the command line, browser with uBlock add on and it’s been years since I saw or listened an ad.