Depends on how deeply you want to protect yourself. Disabling push notifications would help, especially if you disable notifications through individually app s

Depends on how deeply you want to protect yourself. Disabling push notifications would help, especially if you disable notifications through individually app settings first. That should make sure an app doesn't continue trying to send notifications entirely, if you just disable notifications globally Apple or Google may still see notifications that they just don't route to your device. If you really want better protection, use GrapheneOS or a similar de-Googled android device and don't install any Google services. That's the best way to still have a modern smartphone with limited risk that Apple or Google is somehow tracking most use.