Exactly my point of view. I have Airtel 4G sim in my iPhone 5(which is even older than the 5s). Depending on the network availability in different ares of Hyderabad, I do get 4G or LTE signals in my phone.
LTE will be supported by all phones mentioned as 4G/ LTE. Even iphone 5s has LTE support. But not necessarily they will support VoLTE. Currently only few handsets has this support and Apple is yet to be part of it .
Maybe later on they might do a software update and enable it.
I was asking if 5S will be able to ride on Jio through VoLTE after it is launched.
I am sure that 6 and above can.
5s will not be able to ride on Jio at least for another couple of years. Reason being that 5s doesn't support 2300mhz band which is primary spectrum being used by Jio. Later they might roll out back haul of 1800mhz which is compatible with 5s.
6 and above can, but only data as of now for Jio. For voice, which is VoLTE only for Jio, Apple will have to release a software update.
Thanks for checking! That is helpful -- looks like there is no risk buying the 6S from the US.
prior to this, I had purchased second hand iPhone 3 and 5 from the US and they worked great. I had got new iPhone 4 from Singapore and no issues whatsoever. I recently unlocked an AT&T locked iPhone 4, which I was only using for my US trips via an Internet unlocking site and this worked brilliantly as well. It was idling in my cupboard for the past 4 years. This was network locked and again no issues with Indian carriers, though not LTE.