The problem is not willpower. Your phone is optimized to pull you back. Here are practical changes that reduce procrastination without requiring a complete life overhaul.
Remove the fastest distractions first
Start with notification volume. Every notification is a round trip that breaks focus. Turn off all badges and sounds for apps that don't need real-time attention. This is the highest-leverage change most people haven't made.
Make your worst apps harder to open
Move them off your home screen. Put them in a folder inside a folder. Delete the app and access it from a browser when you genuinely need it. Friction between impulse and action is the goal. You don't need to block anything permanently.
Block during your highest-risk hours
Figure out when you're most likely to procrastinate. For most people it's the two hours before and after lunch, or late evening. Block your worst apps during those windows only. You don't need a 24/7 block.
Keep your home screen boring
One page. Only tools you use every day. No social apps in primary reach. A boring home screen removes dozens of daily micro-decisions.
Don't track everything
Checking how much time you spend on apps can become its own form of procrastination. Look at it weekly, not daily.