No problem. I don't use my phone for that type of stuff. I use a Sony media player for that purpose. I store my music, pictures and videos on my computer. The media player connects to my home network, and reads the stuff on my computer, so that I can view them on TV. This is the best way I've found to keep my files in the same place, and it works like a server. Of course, you will need a media player at each TV you wish to use with the system. The media player also has Netflix, Hulu, and tons of free channels.
As far as my phone, I use an HDMI cable to connect it. Especially if you don't need wireless capabilities, this is a great way to connect to your system. If your primary use is to stream music from your phone, and keep your phone in your pocket, the dongle is the way to go. When buying phones, make sure you check to see if it has that capability. There is no phone that is compatible with everything. The manufacturers use bluetooth and sell a dongle, just like they are doing here. It's to get you to buy more stuff.
If you become less reliant on your phone, and more persistent on building your home network, you'll find that your system becomes more and more compatible. You can even download an app that controls the media player from your phone, which is also connected to your home network.