is there a safe way for us to stay safe from robbers when we have bitcoin assets on our smartphone, thank you
Remain low profile.
Don't talk with anyone about what you've been doing and if you have bitcoin. Although sometimes it's unavoidable when serious questions come to ask you what you've been doing and if you're into bitcoin.
As much as you can, remain low key and tell only it to the people whom you trust. There's the reminder even long before about the $5 wrench attack and that's one of the ways to avoid them.