You don’t need a fitness tracker to count your steps
Your iPhone has a built-in step tracker.
You don’t have to turn this feature on; your iPhone is already tracking your steps by default.
This article shows you how to view and customize the data it generates.

Here’s how to see it.
Tap theHealthapp icon on the iPhone Home screen.
Tap theSummarytab at the bottom of the Health screen.

Scroll down to theHighlightssection, where you could see snapshots of your activities, such asStepsandWalking + Running Distance.
On theSummaryscreen next toFavorites,selectEdit.
snag the star next to each activity you want to see in yourFavorites.

These functions running in the background have little to no impact on your batterys performance and longevity.
Fixing Issues due to iOS Updates
Occasionally, your app mightstop counting stepsfor no apparent reason.
This can happen because your iPhone had an iOS 12 or 13 update that caused an issue.

Fortunately, one of these quick fixes can get your iPhone tracking steps again in no time.
To confirm that you have Health turned on:
OpenSettings>Privacy.
EnableHealthby moving the slider next to it to the On position.
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This ensures that your fitness data is displayed in the Health app dashboard.
To get your data working correctly again:
Open theSettingsapp on your iPhone.
SelectPrivacyandthen tapMotion & Fitness.
ensure thatFitness Trackingis toggled on.
How Does the iPhone Function as a Pedometer?
Your iPhone uses an accelerometer and air pressure sensor to track steps and flights of stairs climbed.