An Android device obviously has the ability to listen to EMF frequencies, otherwise it wasn't possible to make phone calls over 900mHz en 1800 mHz and what not. But the Telephony API only allows to address frequencies from the industry standards like 2G, 3G etc.
I'd like to scan the whole frequency range that the hardware antenna allows. I basically want to probe cellphone towers with my droid :) because the EMF scanners are pricey.
What approaches would be possible? I'm thinking about modifying a ROM but I know nothing about that yet. If that were the way to go, how would I talk to the antenna via the kernel or library?
