What is the chip for?
I don't know which of my posts re chips you are referrring to.
Ans: Different applications. Tracking, identification as in RealID and similar, health history, possibly used for monitoring diabetes, heart arrhythmia and similar, used in bank cards. The one I'm most leery of is any app held in the hand or embeeded in the hand for buying and selling as set out in Revelation 18 I think it is.
Any iphone with ipay enabled. I hadn't thought that one through very well, would I be ok to buy one but not use the ipay app? But then I use my debit and credit cards all the time, swipe the debit card with my right hand because even though I am left handed the machines aren't for the left hand use.
The chip now in use can migrate to different parts of the body although if in the hand between the thumb and index finger I would think would be pretty easy to detect any changes.