The Droid series of phones are exclusive to Verizon Wireless. The branding Droid is a registered trademark of Lucasfilm that is licensed for their use (see the article on Droid for details). Many of these phones are also sold in other countries under different names (for example Motorola Droid is called Milestone in Europe); see under the individual articles for details.
It was announced on July 23, 2013 that Motorola will now exclusively manufacture Droid phones for Verizon.