How to Find the Firmware and Baseband Version of Your iPhone
These are instructions on how to find the firmware and baseband version (modem firmware) your iPhone is currently running.
Press to launch Settings from your Springboard.
Press to select General from the Settings Menu.
Press to select About from the General Settings Menu.
From the about screen you can find your firmware version under the Version label.
Scroll down and you can find your baseband version under the Modem Firmware label.