I still have my doubts about how safe can a system that uses mobiles in general can be regarding crypto. Just to mention one stupid case: people loose their cell phones everyday.
I think the security system on mobile wallets is not much different from extension or online wallets, you can access your wallet on another device if your phone is lost, but can other people access your wallet if they have access to your phone? Yes, such a possibility can occur, therefore, don't forget to back up your wallet and log out from the application