If you are using a mobile phone to provide crypto security, you can use a secure software wallet such as Trust wallet. Fraudsters will try to trap you in various ways and they may lure you financially and do not click on the link they provide if you find it suspicious. If you understand how crypto works well, it will be very easy for you to identify the fraudsters. Otherwise, you should never install any unknown app because research well about what you are doing and be aware of it yourself.
By crypto do you mean Bitcoin? We cannot call Bitcoin crypto. If you want to control your Bitcoin wallet through mobile, then you should definitely do it with caution. And it is actually very risky to control your crypto by relying only on mobile. Hackers are very opportunistic and they can hack you through various temptations. I think you need to take some precautionary measures to control your crypto wallet. Another thing is that it is not right to completely rely on your mobile. You should definitely adopt alternative methods.