Modern laptops (netbooks) are compact in size, which allows to work with cryptocurrencies almost anywhere in the world and allow to build a safe line of defense on device. Why use mobile phones to interact with cryptocurrencies when doing so is risky? I also think it's reckless.
Apple devices are also vulnerable and should not be considered as the secure stronghold of cryptocurrencies safety. Just a couple of days ago the security experts have found multiple vulnerabilities in Apple products that allows not authorized penetrations into devices and execution of arbitrary codes.
Regarding Android's devices, the list of the latest vulnerabilities found is revealed by Google in its September security bulletin.