Services refers to the options available to you in order to get the location of your user.
On Android you can have the status of the GPS and Network services. The Network service is often less precise.
On iOS both the GPS and the Network service are available but cannot be requested individually. Either the Location Service is activated or not.
If the service are disabled, you can make a call to
The call will automatically try to activate the required location service depending on the precision request for the location.