During rebate card validation, the IMEI (Handset ID) number submitted showed payment on a previous rebate card submission. This number is unique and specific to each T-Mobile phone or device. A phone or device can only be redeemed one time for a rebate card.
Actions to take:
Double check your IMEI (Handset ID) number: To find your T-Mobile phone 15 digit IMEI (Handset ID) number press *#06# on your phone and hit send. The IMEI (Handset ID) number is also found on the white sticker label required for submission (if you have a photocopy of your submission materials).
Contact T-Mobile Rebate Card Customer Care > to verify the correct IMEI (Handset ID) number was submitted (numbers were not accidentally switched or skipped).