Safety is actually relative to how much you put in to your due diligence. May it be desktop, laptop, cellphone, online wallets, cold storage wallets, etc. Sure some of them are more secure than most. But it is still possible to steal information physically relatively easy with your smartphone.
It's always the end users who can create extra precautions avoiding being hacked but the idea inside this topic is quite informative there's some good edge if you are well aware on how to take advantage and maximize features that you can find from smart phones which is not present from desktops and laptops we just need to utilize it and take it as an advantage.