A few key changes under the hood of Apple’s new iPhone 7 and iPhone 7 Plus hove led to some pretty drastic changes in carrier support.

As first reported by MacRumors, and discovered in the iPhone 7’s specifications fine print, the iPhone 7 and iPhone 7 Plus GSM units are not “globally unlocked,” and do not support CDMA networks at all. So if you purchase a new AT&T or T-Mobile iPhone from Apple, the device can still be unlocked, but it won’t work on Verizon Wireless, Sprint, or any other CDMA network for that matter.

It’s worth noting that, on the other side of the coin, buying a Verizon Wireless iPhone 7 or iPhone 7 Plus will get you a device that also works with GSM networks. So if you unlock it at a later date, you could switch to AT&T or T-Mobile, or another GSM network, without any hassle.

The change can be linked back to early reports that Apple was switching to Intel for its LTE modems, as far as its AT&T phones were concerned. Those Intel LTE modems don’t support the CDMA standard in the United States, so it looks like Apple did indeed go with this change under the iPhone 7’s hood.

It’s an interesting move to be sure, and it will be interesting to see how that plays out moving forward. The iPhone 6s and iPhone 6s Plus were functional across networks, no matter which device you purchased for which network, so it’s certainly worth noting the change this time around.

[via MacRumors