What if I can't see the SMS deleted on my mobile phone?

It's probably poisoning or system failure.

I'll tell you what to do:

The first step is to back up your phone book and other useful information.

Step 2, download an original card file of your mobile phone model from the Internet (you can find it by searching on Baidu) to your computer.

The third step is to format the mobile phone memory card so that there is nothing in the memory card.

Step 3, press *#7370# on the mobile phone, and then a prompt will appear, and then confirm. Then you will be asked to enter your mobile phone password. Nokia's password is generally 12345. In this way, there is nothing in the memory of the mobile phone itself, and the factory settings are completely restored.

Step 4: Copy the original card file you downloaded from the Internet back to your memory card.

Step 5, put the card back on the phone.

In this way, the virus in the mobile phone is gone.