snip
the digital era requires us to save our money on smartphones, now more and more people are traveling with cellphones that contain digital money or even the bitcoins they buy. is there a safe way for us to stay safe from robbers when we have bitcoin assets on our smartphone, thank you
The safest way is don't save your private key to your cell phone. use a "watch only" wallet on your cell phone.
If you import your public key to your wallet and use watch only version then there is no problem if your phone gets robbed, they can't access your funds anymore.
And save your private key to a piece of paper and keep it safe somewhere else. when you want to transact, only that time use your private key, better you could make offline transaction to confirm the best security.