If someone wants maximum security when using mobile crypto wallets, in my opinion one of the safest options is that such wallets are used in combination with hardware wallets. Of course, this requires an additional cost in the form of buying an extra device - but it actually gives us a lot of security because private keys and all important operations take place outside the mobile device.

Although if the tips given by other members are applied, the mobile device can be a fairly secure way to store crypto - emphasizing that it shouldn't be large amounts, because despite all the security measures it really doesn't make sense for me to have thousands of dollars worth of BTC on mobile device.