How to enable NFC on the Samsung Galaxy S II

If you have a Samsung Galaxy S II phone that is running a custom Jelly Bean ROM, you have probably noticed that you do not have NFC capabilities on your device. If you would like to restore that functionality, we have good news – XDA Senior Member jthatch12 has created a hack.
This will only work on phones that had the necessary NFC hardware built into the phone. The other requirement is that the phone is running Jelly Bean. Thus far users have confirmed success on i777 and M250k/M250s devices. The hack should work on:

• i9100 = NO
• i9100P = YES (it’s an i9100 exactly, but with NFC. ROMs for i9100 will work, but need to be modified to show NFC settings, otherwise no NFC options will show)
• i9100G = NO, it’s completely different from the i9100 hardware (TI-OMAP instead of Exynos). ROMs from i9100/P don’t work.
• T989 (T-Mobile GS2) = YES, but it’s completely different from the i9100 hardware (Snapdragon S3 instead of Exynos). ROMs from i9100/P don’t work.
• i777 (AT&T GS2) = YES, AOSP based roms have it but i9100 hellraised roms are missing it(due to NFC not being a feature of the i9100)
• D710 (Sprint GS2) = NO

If you are interested in trying this hack out on your NFC equipped Galaxy S II, you just need to download the file from the XDA forum thread (use source link below) and then flash it onto your device from recovery mode.
source: XDA Developers Forum