Is it able to disable find my iPhone?

Here is the deal. I lost my iPhone, but luckily it was returned to me. Nevertheless, I have to take steps against it. Find my iPhone is a good option but I question it's reliability. So please enlighten me, how does it work? Can it be disabled by a third party? Do I need to have cellular data enabled?

Find your iphone is a great app. Anyone in your family or a trusted person that you have that has an iphone can see where your iphone is. If uou loose it you can easily see where the iphone is from another person's iphone. If you want to disable it then just uninstall it.