Either model, though, can be unlocked, and is capable of operating on either a CDMA or GSM network. There are only two versions of the iPhone 6s sold in the USA.one of them is exclusive to ATT and can operate on a special LTE band that only ATT uses. Apple does not make "special" iPhones for Sprint. My wife has an iPhone 6s from Sprint, that we are in the process of unlocking. If it was manufactured before a certain date in 2015, manufacturers weren't required to build the phone to be "unlockable." I have an HTC One M8 from Sprint that I'll never be able to use anywhere else, since it was made before that date. Some phones CAN'T be unlocked by the carrier. In most cases, your phone will need to be paid off of any lease or payment plan in full, your account will need to be in good standing, and you'll have to have been active on your service for a certain number of days. If your iPhone is eligible to be unlocked by your carrier, they will need to communicate the unlock request to Apple. IPhone carrier locking does go through Apple's servers. That's why you can pop a SIM out of an ATT or T-Mobile phone, stick into another unlocked phone, and go. GSM network devices are only identified by the SIM card. That's why you have to "activate" a phone with Sprint or Verizon. Phones on a CDMA network (Verizon, Sprint, and their MVNO's) are identified by the device itself.
Eventually, I had the phone unlocked and switched to Cricket (NOT by using the MSL. I got the MSL so I could access some of the hidden settings menu.
Example: my Galaxy S7 Edge was on Sprint. Phones on a GSM network do not use an MSL. It is used to access some of the deeper functions of the phone while on a CDMA network, but it does not unlock the device. The MSL, or Master Subsidy Lock code, will not unlock the phone to work on a different carrier.
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