Adding your videos to popular video-sharing sites such as YouTube, DailyMotion, Vimeo, and others is never been easier and faster. This to the most part is also free, which is great because you do need to distribute your videos to as many platforms as possible to reach your audience in a way that matters. These websites usually offer optimized videos for their mobile platforms too, which is also great because it expands the reach of your brand significantly.
This I understand can be time consuming. There are some websites which offer simultaneous uploads to multiple platforms. However in my experience, most of them are neither free nor reliable.