Connecting RF to Android phone?

I am developing a project on home automation and I wish to control my appliances through android using RF. I`m thinking of making a wired connection between android and arduino, where arduino use RF to send and receive data and transfer it to android.

I don`t know if it will work or not, if you have any suggestions please share.

Bluetooth, wifi, etc.

No, i have to use RF as i need to control multiple devices and want to keep down project cost. if anyone have any information please share. I need to connect a RF module to arduino(or other microcontroller) which can transfer that data to an android device.

Do you think Bluetooth and WiFi are not RF?