Was looking at this here
click me.
Careful with those worldwide phones from China.
They operate on different bands. Most don't work in the states.
Not saying that is the case for what you are looking for, just giving you a heads up.
Some linkage...
https://en.m.wikipedia.org/wiki/Cellular_frequencies
eta:
I noticed your carrier is AT&T.
Here are their bands:
AT&T 4G HSPA and HSPA+ use
850Mhz(Band 5) and 1900Mhz(Band 2) bands but it all depends on area if they own a license.
LTE uses Band 17(700Mhz), Band 5(850Mhz), Band 2(1900Mhz), Band 4(1700/2100Mhz) currently.
The specs for the phone you ordered:
2G: GSM 850/900/1800/1900MHz
3G: WCDMA 900/2100MHz
4G: FDD-LTE: 800/1800/2100/2600MHz
Cancel your order if you can.