I do't remember anyone having their funds stolen from an Android/iOS wallet, but I see many people being robbed on desktop computers due to malware. But the risk still exists, we must never lower our guard with mobile devices.
So far it seems that no one has experienced the loss of funds from an Android wallet, and I think this is also because of the support provided by
Google Play Protect, while iOS itself I don't really know. As for the theft cases that occur to Android users, it is usually due to the user's own error, or maybe because they do not use a wallet application available on the Playstore (outside the Playstore, or usually written "Unknown Resource" and indicating that it is not trusted), and I often see applications outside the Playstore scattered, I do not recommend anyone to use this type of apk.
Even if anyone really wants to use an application outside the Playstore, then you should make sure it is really safe, if I'm not mistaken one of the characteristics is an open source application, and this is really verified by an expert in it field and he should be trustworthy. Personally, I prefer to install the application with my Android phone which is used as a scapegoat, and of course does not have any important data on it, but in any case this is still very dangerous, you should still use a trusted application that is already available on the Playstore, and it is really trusted and widely used by people.