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I had been trying to pick up a 64GB, Space Gray, 6s Plus just by walking in but everywhere was soldout. On 10/6 I finally decided to just order through the AT&T website and wait for it. It initially gave me a shipping time of 11/3 - 11/10 when I ordered it. The next day, 10/7, I received an email saying it had shipped. It arrived at my door on 10/8 at about 7PM.
 
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