Nokia 3586i / 3588i
SIM Slot ????
My first guess would be that its only because it uses the case of another GSM phone but it even has the contacts and all. This doesn't make sense.
After that I could make an assumption that its either for future use or simply for further memory expansion. Memory expansion would be nice but I have a feeling this is not the case as it is not documented and that would probably be a feature they would want to document.
I've noticed it on my phone for a while and never cared much.. now I am curious and determined to find out what Nokia's reasoning was in putting a SIM slot on a CDMA phone! ;) hehe