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Thanks for the input guys. I am in South Florida so I know Band 12 is here. I am currently on ATT though and thinking about making the switch, but just hesitant because of poor network stories I have heard.
I live in Boynton Beach, and have seen Band 12 only a very few times. I'm pretty sure it will only use it as a last ditch effort before having to drop to 4G, as it may have a stronger signal than band 4, it's also slower.
 
I have a 5s and my Wife has a 6s. On a recent 1500 mile driving trip to the Northeast we noticed several times where the 6s had one more bar than the 5s. I can't say if that actually translates to better data or calls, as we rarely had occasion to use them at the same time while we were driving.
 
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