This feature helps you to change the location (geo-data) of an IOS phone. This is required while testing location aware Apps.  

For your location aware Apps, you can change the geo-location of the device, which in turn will pass the changed location to your App. 

1) Connect to the device, select Device settings tab and click on set phone location.

2) Select the Geo location on the Map pop up window. Select desired location on the map.

3) phone location will set to desired location which you have selected.