Thanks for that info and choosing the Apple Support Communities. If I understand correctly, you are unable to use Location Services on your iPhone 6s, even after trying some troubleshooting steps. If you haven't already, please reset Location Services with the steps below, and then restart your iPhone as iOS clears cached data and does other system optimizations when you turn your device off and on. Also check out these tips on improving GPS accuracy.
Reset or disable Location Services
Location warnings are the requests that apps (such as Camera, Compass, and Maps as well as location-based third-party apps) make to use Location Services with those apps. An app will ask for permission the first time it needs to access Location Services data. Tapping Allow will give that app permission to use Location Services as needed. Tapping Don't Allow will prevent an app from accessing Location Services data. Apps won't use your location until they have asked for your permission and you grant permission.
If you would like to reset all of your location settings to the factory default, go to Settings > General > Reset and tap Reset Location & Privacy. When your location and privacy settings are reset, apps will stop using your location until you grant them permission.
Improve GPS accuracy
GPS accuracy depends on the number of visible GPS satellites. Locating all visible satellites can take several minutes, with accuracy gradually increasing over time. To improve GPS accuracy:
- Make sure that you've set the date, time, and time zone correctly on the device in Settings > General > Date & Time. If possible, use Set Automatically.
- Keep a clear view in several directions. Walls, vehicle roofs, tall buildings, mountains, and other obstructions can block line of sight to GPS satellites. When this happens, your device uses Wi-Fi or cellular networks to determine your position until the GPS satellites are visible again.