If the location services or share my location Settings on your Apple iphone , iPad , iPod touch seems grayed out and you cannot make changes to it , you might have accidentally set a restriction on it . Tap location service and make sure to allow changes to be checked and location service is set to on ( green).
Steps to Change Location service on iPhone
Step 1: Open settings.
Step 2: Click on screen and time >> content privacy and restrictions.
Step 3: Tap on location service.
Step 4: Make sure allow changes is checked and location service is set to on (green).
Step 5: Go back out to the content privacy and restrictions screen.
Step 6: Tap on share my location.
Step 7: Ensure that allow changes must be selected.
Step 8: Once this is set, go back to settings >> privacy >> location service
Step 9: settings and then you may able to make changes.
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How to Turn on Location Access on an iPhone or iPad ?
Step 1: Open settings.
Step 2: Tap on privacy.
Step 3: Tap on location service.
Step 4: Toggle the switch to on.
Step 5: Scroll down to the yelp application icon.
Step 6: Select while using application or always
How to Turn on Location Access on android ?
Step 1: Open settings.
Step 2: Tap on location.
Step 3: Tap on Google location reporting.
Step 4: Tap location reporting.
Step 5: Then , toggle the switch to on.
By following above steps you can easily change location services on iPhone and iPad and tun on location services on iPhone and android as well.