[Q] How do I know if this phone is Unlocked or not?

I have the SM-N910F on Android 4.4.4 and baseband version N910FXXU1ANJ4. How do I know if this phone is locked or unlocked. Will I be able to flash other firmwares on it? or flash custom ROMs? I Inserted an Iraqi SIM card into it but it didn't work.

It was purchased from sweden

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