If someone has installed the Blue Wallet app on their Android then imports it from the Trust Wallet app by entering the phrase as I explained above, that means that's not a safe step. Maybe you mean a safer step is to move coins by sending coins from the Trust Wallet address to the Blue Wallet address. Is it really like that?
Ask yourself why are you are even switching wallets in the first place? Obviously, there must be something you don't like about the Trust Wallet that warrants the change you are making. If that wasn't the case, you wouldn't be making the switch, would you? But because you did, you should abandon everything that has to do with your old wallet. The seed is the most important part of your setup. Replicating it in multiple wallets weakens your security, and it doesn't solve the problem that recovery phrase originates from a client you decided to abandon to use something better.
Now I understand. Thank you Pmalek.
I need to learn a lot about technical matters including wallet software issues.
Maybe some of the members who visit this thread don't dare to ask questions like I asked. I think the explanation you provide can be the right answer for all members who use Trust Wallet because many don't know Trust Wallet has changed.