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iphone terminology - locked / unlocked: There's different things that can be locked / locked, right?

Can someone help me out?  People talk about iphones (maybe droids, too, but I'm just interested in iphones) being 'locked' / unlocked.

There's actually several different locks right?

I hear how 'all' iphones  (5, s, 6, 6s?) are unlocked these days because of FCC rules? But then I hear that they aren't unlocked unless you paid full retail?

There's locked / unlocked for international use and seperately for domestic use, right?

I had an iphone 5 that was on verizons network for 2 years and then replaced by an iphone 6s.  Somewhere / somehow, the phone's 'activation policy was changed to sprint (and it wouldn't work on the verizon network / would say 'sim not valid'' for verizon SIMs).  but the apple store said the phone was unlocked.

thanks!
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If the phone was unlocked by apple, it should be able to use a sim from any network carrier.  Only thing is Verizon uses cdma and if you put a cdma card in a gsm unlocked phone it still may not work.
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cdma / gsm - ah! That's another question.  Nowadays when you buy an iphone for carrier x or carrier y, am I right in my assumption that the phones are physically identical? It's just the sim for the appropriate carrier that differs? in other words, newer iphones have both cdma and GSM circuits?
I realize there ARE differences. I am wondering if the newer iphones have both circuitry in them so that you can move from carrier to carrier with the same phone on a technical basis.  

then the issue keeping you from moving is locked / unlocked.  But as I say at the top, I thought all newer phones are unlocked?
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