The international version will not work as it lacks the 1700 MHz band. There was a model of this phone made for AT&T which is the SGH-I537. That one would work as it has the 1700 band. If you look closely at that page you linked, you will see 2 lines of frequencies for 4g network LTE. The bottom one is for the AT&T model. Look for the model number in settings > about device. If it isn't a SGH-I537 model number, I would return it immediately.
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