Phones nowadays are very cheap comparing to how much we have now in our crypto assets so better
not use or exploit your phone than using separate phones like what others said here and i believe
this is the best advise to do.
I would say not just for the crypto but overall the internet is filled with malware that can compromise our privacy so using phones that don't have any personal files should be the better option to connect to the internet but it isn't practical though and after all we are living in the era where people prefer storing everything over cloud storage over their phone.