Replacing BT module with 433 MHz transreceiver module I have made a prototype where I can send data from one arduino to another via Bluetooth(hc-05), they are working fine, but now I want to replace the BT module with RF module, how can I do that???
Yes, use VirtualWire or RadioHead. You might need to "evolve" your protocol to handle message fragmentation and loss. RadioHead has support for that. 

Cheers!