The easiest way to remove EXIF GPS/geotag location data on the phone without any 3rd party apps is to simply take a screenshot of the photo.
Yes, you lose quite a bit of resolution/detail, but it’s the fastest way to upload a photo to eBay, Craigslist or email without accidentally revealing the photo’s location to the world.
On the Mac, you can remove location data with Preview, as this article mentions:
If you’re comfortable with the command line, you can also use Phil Harvey’s exiftool, like so:
# Remove GPS EXIF metadata from given image files:
exiftool "-gps*=" path/to/image1 path/to/image2 …
Eperitus 