This will definitely help if you haven’t already seen it:
I would recommend position 0 for an NFC/RFID implant, and position 5 for an xG3 v2 if you decide to get one.
I figure it’s worth explaining why this is true. The NExT is a combination of the xEM and xNT chips put inside a single implant. The main benefit is obviously that you only have to do one injection instead of two. You would likely have a slightly better read range with the xEM/xNT then you would with the NExT, but it’s definitely not enough to justify implanting them seperately.
Like Don said, unlocking an iPhone with NFC isn’t possible, but your laptop definitely is. If you get a KBR1 (which comes with the NExT + access kit 
), you can easily scan your hand to unlock your laptop. It acts as a standard USB keyboard when plugged in, and types out the ID of any HF (NFC) chip it scans. I personally set my laptop pin to my NExT’s UID, and have a backup password in case I don’t have the KBR1 with me.