What I want to do now is to find a new phone, because I have some Galaxy phone from 10 years ago, so im assuming this Android version it's using is not updated and thus dangerous to use.
You can always wipe the outdated OS and use a FOSS one instead. In addition to the distros ETFbitcoin has already mentioned, there is also Ubuntu Touch. Your best bet will probably be LineageOS or DivestOS though, which both support a wide range of old Samsung models:
https://wiki.lineageos.org/devices/#samsunghttps://divestos.org/pages/devicesI would then basically use Electrum, and transact through Tor. I would need to consider if I would even need to transact through my node or just use some of the reasonable to use servers through Tor. Since the amounts aren't even big, it should be enough. And I don't want to connect my phone back to my node which is sitting at home physically anyway, I would rather compromise using someone else's server and send through there.
If you are only using the wallet to store a single UTXO received from elsewhere and then to later send that UTXO to your trading partner, then there will be minimal privacy loss from using a third party Electrum server via Tor. The server would be able to see all the other addresses in your wallet, but provided you are never going to use them for anything then that is irrelevant. It does mean using a new wallet for each trade you make, though, otherwise the server would be able to link all your trades to the same person.
Did further research on this and turns out there's another option, Replicant OS:
https://www.replicant.us/freedom-privacy-security-issues.phpMobile devices such as phones and tablets are taking and increasingly important part in our computing, hence they are particularly subject to freedom and security concerns. These devices are actually full computers with powerful hardware, running complete operating systems that allow for updates, software changes and installable applications: this makes it easy to run free software on them. Mobile devices are often used for communications and provide hardware features that are sensitive when it comes to privacy and security: GPS, camera, microphone, etc, in addition to storing the user's data. Hence, they are particularly subject to being used to spy on the user.
I don't think it gets as anymore free as in freedom than Replicant for the mobile phone, the problem is, just like how it happens with computers, you are limited to a tiny amount of devices that meet the requirements. So you would need to find some ancient S3 phone. Would Electrum run there?
Note that even if you get the higher open source levels here, the last security update for Android 6 is was from October 2017, so that's another compromise, so at some point you have to wonder where is the balance there.
