Remote A/C

I have a question about the remote a/c....I've never gotten it to work from my iPhone Entune application....it always give a failure notice....and I am wondering what the range is from the key fob button.....it doesn't make sense to turn it on from the key fob if you're only a few feet away since it just turns off once you open the door....or does it have a long range that I don't know about?

If you have an idea of how to fix the iPhone application so it works, please let me know!

Thanks