Hi there! I understand that the Cube Master 3D app is freezing on your iPhone, and I’m here to help you get it sorted out. Let's go through a few steps together to try and resolve this issue.

1. Restart the App: Sometimes, simply closing the app and restarting it can help. To do this, swipe up from the bottom of the screen (or double tap the home button on older iPhones) to bring up the app switcher. Then, swipe up on the Cube Master 3D app to close it, and reopen it.

2. Restart Your Device: Restarting your iPhone can clear up temporary glitches. Just press and hold the side button until you see the slider to power off, then slide it to turn off. Once it's off, press and hold the side button again to turn it back on.

3. Check for Updates: Make sure that both your iOS and Cube Master 3D app are updated. Go to the App Store, tap on your profile picture, and scroll down to see if there’s an update available for Cube Master 3D.

4. Clear Background Apps: If you have many apps running in the background, it may slow down your device. Try closing any apps you don’t need running at the moment.

5. Reinstall the App: If the issue persists, you may want to uninstall and then reinstall the Cube Master 3D app. You can do this by pressing and holding the app icon until a menu appears, then selecting “Remove App.” After this, you can reinstall it from the App Store.

Let me know how these steps work for you! If the problem continues, we can explore further options together. Are you satisfied with the solution I provided so far?