The Dell service tag is a seven character identifier that is unique to your product. In addition to the service tag, there is an Express Service Code which is a 10-digit numeric version of the service tag which can be typed into a telephone for call routing. While most Dell products have a service tag, some accessories and peripherals do not. As a general rule, desktop and notebook computers, servers and storage devices, printers, and mobile devices (such as phones or tablets) will have a service tag.
Dell Wyse Service Tagged Product
Non-Dell Service Tagged Product
Note : In addition the Service Tag can be identified from the Wyse Serial number (BIOS) or Wyse “SID” on the label ( xxxAyyyyyyy). In both instances if the 4th character in the Wyse Serial number/ SID is “A”, then the last 7 digits of the serial number will be the Dell Service Tag.