and sometimes you have to go into an editor like Paint. Rotate, save, then rotate back, save.
I HATE how iPhones and certain web servers do/dont honor the orientation codes embedded in the file. I had one that would look fine on my desktop, but once it hit a webserver like eBay it would rotate. thats where I found the trick I suggested.
^This.
It is the same reason I quit offering items in the classifieds. I'm not computer savvy enough to get pictures from my phone to my computer, let alone "host" them somewhere, and then transfer them...
I pass.