Hi there! I understand that your Steps app locks up when you open it and only shows the current day's activity. Let's figure this out together.

First, could you tell me if this started happening recently or after any update? Also, have you tried closing and reopening the app or restarting your iPhone to see if that helps?

In the meantime, here are some steps you can try with your iPhone running iOS 18.6:

1. Force Close and Restart the App:
- Double-click the Home button or swipe up from the bottom and pause (depending on your iPhone model) to open the app switcher.
- Find the Steps app and swipe it up to close it.
- Then, open the app again to see if it loads correctly.

2. Restart Your iPhone:
- Press and hold the side button and either volume button until you see the slider.
- Slide to power off, wait a minute, then turn your iPhone back on.

3. Update the Steps App:
- Open the App Store.
- Tap your profile picture at the top right.
- Scroll to see if Steps app has an update. If yes, update it.

4. Check for iOS Updates:
- Go to Settings > General > Software Update and see if there is any update beyond iOS 18.6.

5. Reinstall the Steps App:
- Press and hold the Steps app icon until a menu appears.
- Choose "Remove App" then "Delete App".
- Go to the App Store and reinstall Steps.
- This sometimes clears corrupted data causing freezes.

Since you mentioned it only shows the current day’s activity, it could be a syncing or cache issue inside the app. Reinstalling helps refresh that data.

If the problem persists after these steps, let me know if you see any error messages or specific behavior, and we can dive deeper together.

Are you comfortable trying these out?