Microsoft Lumia 640 LTE Quick Manual page 23

LIMITED WARRANTY CARD
To assist with your claim for Warranty please bring the original proof of
purchase, which clearly indicates the name and address of the seller, the
date and place of purchase, the product type and the IMEI or serial
number. In addition to the proof of purchase, for future reference, this
card is available for your retailer to record the information here to
support your claim for Warranty.
Device Model:
Date of Purchase:
Device IMEI:
Owner's name:
Owner's contact:
Retailer's name:
Retailer's address:
Retailer's stamp
For Care support info, please visit www.microsoft.com/mobile/
support/.