[oldDummy]

Will this work on AT&T in the US?

Especificações
.....
Dimensões

Largura: 73.3 mm

Altura: 143.5 mm

Curva: 8.3-11.2 mm

Bandas

LTE Cat 4 (Bands 2, 3, 4, 7, 17)

UMTS / HSPA+ (850, 900, 1900, 2100 MHz)

GSM (850, 900, 1800, 1900 MHz)

Cartão SIM
Nano-SIM
........
NFC
Sim

[ChazzMatt]

YES. As long as the phone is unlocked.

GSM/UMTS are perfect.

For LTE AT&T currently uses LTE bands 2,4,5,17.

This phone has everything, but LTE Band 5.

AT&T only uses Band 5 in some areas; it's not ubiquitous. In those areas where LTE band 5 is used to supplement the other bands, you would stay on the other LTE bands but might have slower speed if there's lots of congestion. AT&T uses LTE band 5 in heavily congested areas to offload users to lesser used frequencies, if their devices have band 5 capability.

But there are also a few areas where AT&T has GSM/HSPA and only LTE band 5 (with no other LTE bands available). In those areas where ONLY LTE band 5 is available, your imported phone would drop down to GSM/HSPA instead of having LTE.

However, this is an expensive phone to import and you need to make sure it's not locked to the Brazilian carrier...