How do I check most steps in a day on iphone?

Hi simon_a6,

For help with locating your data for steps, check out the information below found in the article here: View your data in Health on iPhone

"View trends, highlights, and details for a specific health category

Tap Browse at the bottom right to display the Health Categories screen, then do one of the following:

• Tap a category. (To see all categories, scroll up and down.)
• Tap the search field, then type the name of a category (such as Mobility) or a specific type of data (such as Walking Speed).

Depending on the data type, you may be able to do the following:

• View details about any of the data: Tap .
• See weekly, monthly, and yearly views of the data: Tap the tabs at the top of the screen.
• Manually enter data: Tap Add Data in the top-right corner of the screen.
• Add a data type to Favorites on the Summary screen: Turn on Add to Favorites. (You may need to scroll down.)
• View which apps and devices are allowed to share the data: Below Options, tap Data Sources & Access. (You may need to scroll down.)
• Delete data: Tap Show All Data below Options, swipe left on a data record, then tap Delete. To delete all data, tap Edit, then tap Delete All.
• Change the measurement unit: Tap Unit below Options, then select a unit."

You can also export your health data and ensure it's sharing with other apps with the steps here: Share your data in Health on iPhone

If you need further assistance, reach out to Apple Support directly.

Contact Apple Support

Contact Apple for support and service

Best.