iPhone steps in bag

Do you have a gps watch for golf, I have a garmin S 12 and just found out it does distance covered ?
 
I’m aiming for 10,000 steps a day in an attempt to get fitter / lose a couple of stone.
Will an iPhone pick up steps whilst in a carry bag?
It is the only way I count steps and I don’t want to purchase a Fitbit etc.
Will you zigzag up the 18th and ruin your score if you haven't reached the required number of steps?
 
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