SOBER just post ur IMEI here i will post the unlock code.
Tebes, the reason its not prompting you for the unlock code is becasue you are using the same modems original User interface(UI) that will identify the foreign simcard as invalid. If you have an orange modem, install the safaricom UI first, insert your simcard and let the SAF UI detect the modem. A small pop up will appear asking for the unlock code. :)
Excelsior