I want to transmit a certain data with a certain data rate and my USRP doesn't support this high rate so I'm thinking if I can by any way change my kernel ( 2.6.35.7) to make the mobile transmit signal, or are there any apps that can do this ? plz help!!!!
Theoretically yes, practically, no. The problem is that the RF blocks of a mobile phone are not documented and there is no way you can modify the phone to transmit anything unless you know how to modify the RF (modem) block of the chip inside your phone.
As for GNU Radio, I don't think it is possible to run GR on a mobile phone (yet).