Will an Apple Watch 4 with watchOS 7.5 keep track of steps if you’re not carrying your iPhone with you?
Will an Apple Watch 4 with watchOS 7.5 keep track of steps if you’re not carrying your iPhone with you?
Apple Watch, watchOS 4
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Yes. You should make sure your watch is calibrated first:
Calibrating your Apple Watch for improved Workout and Activity accuracy - Apple Support
Also see the "Make sure that you earn Move and Exercise credit" section in:
Get the most accurate measurements using your Apple Watch - Apple Support