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Exploits and security breaches can happen on any smart devices that is why crypto hardware wallets are the best option for any security breach like this one, same thing is happening on android devices, i think smartphones that are built with blockchain tech in mind are even better than hardware wallet e.g bitwings mobile that has better security features and 3FA introduction
^ It's not really advisable to use an android phone or smartphone as a bitcoin wallet. Definitely right, as of now, the best wallets are those hardware wallets that contain seed phrases and of course strong password. Here is my conclusion, I think just because the version of it is too old then and the bitcoin wallets, for now, are more up to date so in order for your android phone to be compatible on it. You should need to be able to upgrade on a higher version gadget for you to use all the features smoothly but the best option is never to use a phone as your bitcoin wallet.