that's pretty simple .. for unlocked phones you can check the ABOUT section in settings to know which firmware you're phone is running.
A problem arises if you want to check the firmware of a phone which is locked. To do this simply, put you're iphone into DFU mode aka recovery mode and connect it to you're PC. Once connected, itunes would popup a message saying that a iPhone in recovery mode has been detected, what you do now is hit RESTORE and you'll see the downloading, pause the transfer but dont hit cancel. Now navigate to the temporary download for itunes to read the name of the firmware.
For windows based systems the location would be commonly at
[operating system drive]:\Users\[username]\AppData\Roaming\Apple Computer\iTunes\iPhone Software Updates
the version should be something before the file type of the firmware file.
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