How to safeguard my crypto in Andriod Phone

Well I will say it is better that way if you can afford to buy another phone that you won't be using all you have to do is to keep it and store all your information there however it is good but it has disadvantage, something happened to me years ago I had two phones one I was not using I just kept it and a family friend of mine came to my house and was able to access my room and took the phone where I hide it, some weeks later I decided to take the phone and do something with it when I checked where I kept it I did not see it again and I started looking for it, it was my little sister that told me that my family friend entered my room and I confronted him that was when he told me that he was the one that took it so it is still very risky to do such.