Not sure if the new resolution is going to be any sharper, they will probably say it is but it will just be to fix the new size phone.
NFC is near field chip, think of those credit cards where you just wave it and it pays, no swiping required. That is NFC technology, this will allow you to possibly put your CC in your phone, boarding pass, gift cards, etc.
LTE is both AT&T and Verizon
New cables yes, but this will be a good upgrade based on what we know so far. I am sure there will be adapters made for all the old cables you already have.
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