1. Completely Turn Off for Photos On iPhone
Open Settings > navigate to Privacy > Location Services > On Location Services screen, scroll down and tap on Camera.
On the next screen, select the Never option to completely Turn OFF Geotagging for Photos on your iPhone.
2. Selectively Enable or Disable Geotagging For Photos on iPhone
Instead of completely disabling location you can make the Camera App on your iPhone to prompt you to Enable or Disable Location information on a case by case basis.
Go to Settings > General > Transfer or Reset iPhone > Reset > On the pop-up, tap on Reset Location & Privacy option.
On the next screen, enter your Lock Screen Passcode > on the confirmation pop-up, tap on Reset Settings to confirm.
The above steps will Reset Location and Privacy Settings for all the Apps installed on your device.
Now when you use the Camera on your iPhone, you will be provided with the option to Enable or Disable Location information, every time you open the Camera App on your iPhone.