Don’t bring the phone to washroom
There’s other possible causes, i wouldnt be so quick to jump to stimulants as a solution
People who claim they're addicted to every vice under the sun usually have a physiological explanation for their lack of impulse control and executive function
I'm not a doctor and this shouldn't be taken as medical advice, but it's always worth looking into.
These things tend to get internalized as personality shortcomings and dismissed