had any one worked on arduino

hi im doing my final year project im trying to control a mechanical structure from my android phone for the communication b/w phone and structure im using cc2500 which is wireless transmitter and receiver
RF

so now the question is i m using arduino for the communication b/w phone and cc2500 circuity do some one know about that im stuck at one point how can i make my phone as usb host im using usb host sheild on arduino uno