The Unlocked iPhone 6S Plus comes in two models for US carriers: A1634 and A1687. There is also model A1699, but it is intended for Chinese carriers so isn’t considered for this article.
This post is part of our Unlocked iPhone Buyers Guide, which covers everything you need to know when buying an unlocked iPhone.
This article will help answer the question: Which unlocked iPhone 6S Plus should I buy for my carrier network? We’ll discuss the model differences, carrier compatibility and help you choose the right iPhone 6S Plus for Verizon, AT&T, T-Mobile, Sprint or your favorite MVNO.
Unlocked iPhone 6S Plus: A1634 vs 1687
Both the A1634 and A1687 work well on any US carrier, including Verizon, AT&T, T-Mobile and Sprint.
The A1687 is for GSM and CDMA, sold as the carrier model for Verizon, T-Mobile and Sprint. Overall these are the most compatible devices Apple has ever made. The carrier differences noted are not especially applicable any more, but how they were sold initially.
There is one band difference that makes the A1634 preferred for AT&T users. The A1634 model supports Band 30 on 2300 Mhz (2.3 Ghz) also known as Wireless Communications Service (WCS). Band 30 is an LTE band sometimes used by AT&T for big cities. The A1687 will work fine on AT&T, just won’t take advantage of band 30.
The Unlocked iPhone 6S A1634 is sold by Apple as the SIM-free model and is typically used by Apple for replacement devices. It is also the preferred model for MVNOs such as Cricket, Ting, US Mobile and others.
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