Welcome to GYE
First, stop fears about the future like "I will eventually fall"
Past has gone, future is a mistery, all that counts is the present. Now.
This is normal that the pictures are now in your head, they will not disappear in one instant like "Poof ! Magic ! It's gone". During a moment they will return again and again. And after, they will begin to fade.
But remember : these are only thoughts produced by your brain because of addiction. Don't focus on them, and don't try to fight them, because it's like trying to punch a ghost. Instead : focus on anything else. Make your life occupied with positive activities that will make your mind busy.
There is is also a technique called "Swish Pattern" for bad thoughts, you can take a look at it.
You made the first and most important step by locking your phone ! Pray also for Hachem help. And only a day, an hour, a minute at a time ! Don't be preoccupied about future, the important is NOW