Hi,

what i think is that its not so easy to spoof the imei.

So my theroy is that the imei will be send by the gsm modem firmware and not the phoneapp.

i don't know about the n900 but i know from my openmoko freerunner that the gsm firmware is closed source. so
if its the same on the n900 and the gsm firmware sends the imei

its only possible to spoof the imei by altering the gsm firmware.