Can I use my cell phone as the remote

Does your Android have a built-in IR blaster?  They last I read, Android from Samsung, LG and HTC have built-in IR blasters to communicate directly with home theater components.

If not, you'll need to connect an IR transmitter to your Android.  A transmitter could be an infrared blaster, dongle, WiFi/Bluetooth-to-IR converter, etc.

If you can transmit IR signals...also the last I read...third-party universal remote apps, such as IR Universal Remote or Galaxy Universal Remote, might be worth researching.