You can still make calls through VoLTE on Sprint and Verizon but it is a model that is meant to be sold with the other two. While the A1660 worked with Verizon and Sprint, the A1778 model of iPhone 7 works along with T-Mobile and AT&T.
This model is not very different but there is a lack of support for TD-SCDMA and CDMA EV-DO Rev. A1660 A1660 on Verizonīuy iPhone 7 Unlocked on Amazon iPhone 7 A1778 details The part numbers based on the color options on network providers, are as follows. The TD LTE bands supported are as follows: TD-LTE bands 38 (TD 2600 MHz), 39 (TD 1900 MHz), 40 (TD 2300 MHz), 41 (TD 2500 MHz).Network bands supported by iPhone 7 A1660 The SIM-free version will also have this model number, while in the U.S., Verizon and Sprint offer the iPhone 7 with A1660 model. The markets where this model is available include United States, Puerto Rico, Hong Kong and China. This one is said to be the global variant having both CDMA and GSM support.
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The reason for that is, Apple iPhone 7 and 7 Plus have model chips from two manufacturers, Intel and Qualcomm, and their performance comes at a question with all the network carriers, thus Apple has to launch different models for a perfectly working model for a specific carrier. Now, you might also be wondering what is the reason for this different model structure from Apple when they could have one model across all regions. You should be careful about the model you are choosing because every model has some carrier restriction, and if you don’t want to see these restrictions on your device, the SIM-free version is what you should get. So, let’s check out the different iPhone 7 and iPhone 7 Plus models and the differences between them. Just like how it is every year, Apple has launched the iPhone in several countries with different carrier support, thus making it confusing for users on which one to choose, especially when you are a traveler and are unsure whether the iPhone 7 you are going to purchase will have a support for the network providers internationally.