Follow the tutorial to learn how to do it.
1. Install LogMeIn on your Android Phone, its a paid app but we all have ways of getting them free :3
2. Install it on your PC, its free for PC
3. Register on the phone and pc.
4. Login to your Pc, put in the Username and Password on your computer when it asks.
5. Open up steam, tf2 and Enjoy!
P.S- Its pretty laggy and you cant do much. But its a good way to admin the server when you cant use your pc. Audio quality is good, and you can type. Ive also timebombed off my phone.
If you cant get it working, add me as a friend and ill help you do it.
Not sure if it works on iPhone, although it should.
Also...this kills your battery like a mutthaf***er, so plug into an outlet.