I'm thinking about selling my iPhone 7 plus and my wife's 7 to ATT and using the promotional card towards monthly phone bills. I've looked at the information online but have a couple of questions regarding the estimated value they calculate for you. 1) Do you receive the value they calculate or could they change it once receiving your phone? I'm not planning on lying or anything but my phone is slightly bent and I'm curious if they adjust values once they receive phones. 2) If they can adjust the value once they receive your phone, can you decline and get your phone back? I just would like to be able to weigh my options to either keep as a spare or take the money. Thanks in advance for any help/responses from you guys!