what is a R-sim and factory unlocked?

[thush973]

what does R-sim and factory unlocked means?what is the difference of R-sim and factory unlocked?

 

[hang-the-9]

https/discussions.apple.com/thread/7408348?start=0&tstart=0

The correct way to unlock a phone is from contacting the carrier the phone is from. Factory unlocked is just that, a phone without restrictions about where you can use it (outside of actual antenna restrictions of-course).