Here's the firmware info: Just check out and compare it to your device current baseband version. Seems its still the same baseband build from previous 2.3.5.
PHONE: I9100XXKI4 (seems old modem same as of from 2.3.5)
Stock ROM download via sammobile link (for advance user only)
Some users keep on asking.. when the Ice Cream Sandwich to be release? Well, according to Samsung it's going to be push out towards the end of the first quarter of this year. The leaks keep on coming so far, we all better keep on waiting.