Implement GSM transceiver using Nokia 3310

I am working in the project in which i want to implement the GSM
receiver and transmitter.
I want to take input for gnu radio from First IF stage(71Mhz) or 2nd IF
stage (13 MHZ) of a mobile PCB.
For this purpose i am using the PCB of Nokia 3310. Can u tell me that
what exactly is the point on the PCB of nokia 3310 from where i should
extract one of these frequencies? Is the encryption at this stage is the
same as of the 900Mhz or 1800Mhz signal?