do the following.
1. Insert r-sim together with your sim.
2. a menu will come out ( you have to be very quick for the next three steps as this menu may disappear shortly )
3. choose iphone 4s
4. next, choose input imsi
5. type 2341091
6. press ok.
7. Press power button and shutdown device.
8. Open device again.
9. If it is working it is ok.
10. If " no service" , go to this page from your Iphone "
http://www.rsim5.com/nano4g "
11. Install and agree to everything that will ask you to.
12. open Ir0se tool that will appear on home screen.
13. click " force 2g " - should say patch ok
14. shudown and open again your device.
15. Now you should have signal.
If one step 2 the menu disappears you have to input rsim you another sim card on your phone(whatever sim card), let the menu appear, and the input again rsim with the first sim card that your are going to use. This way the menu will appear again.