Why different iPhone models 7?

If A1660 and A1661 spread on both GSM and CDMA bands, why 1778 and 1784 exist? What happens if I buy a 1660 and use it on Tmobile or ATT? Will be one of my speed be set against a 1784? I heard that this happens. If I want the best possible speeds do I NEED to get a 1784 if I'm going to Tmobile or ATT?

I would like to get an unlocked phone for use on tmobile, att or cricket but don't know where to get


Please see the list of LTE compatibility below for which model you need for your chosen business.

https://www.Apple.com/iPhone/LTE/

Tags: iPhone

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