Determine the kind of kindle you have

My friend got a Kindle DX as a present and he needed to know if it was a Global Wireless or a US Wireless version.

Fortunately I found this page that helps you determine what kind of kindle you have based on the serial number. Here is the link:

http://wiki.mobileread.com/wiki/Kindle_Serial_Numbers

Shortly, here is the bottom line based on the first 4 digits of the device's serial number:

B001 = Kindle 1
B002 = Kindle 2 U.S. (Sprint)
B003 = Kindle 2 International (AT&T)
B004 = Kindle DX U.S.
B005 = Kindle DX International