看见这个,是真的吗?里面说activate and maintain service with AT&T for 15 days,这是嘛意思?还是要和AT&T签约15天吗?明白人给讲讲,这个“postpaid wireless service ”指要签约吗? 多谢 http://creditcards.citicards.com/usc/ATT/rewards/2015/Mar/acces Only phones (smartphones or basic/feature phones) purchased from AT&T at full retail price (no annual contract) through the link provided are eligible. You must activate the phone with qualifying AT&T postpaid wireless service (including voice and data as applicable) and keep the phone, and remain active and in good-standing, for at least 15 days. Excludes phones purchased via a 2-year wireless agreement, pre-paid or AT&T NextSM