Samsung Gravity series
The Samsung Gravity series of mobile phones includes:

 Samsung Gravity, released November 7, 2008
 Samsung Gravity 2, released in August 2009
 Samsung Gravity 3, released in June 2010
 Samsung SGH-T669 (known as the "Gravity T" or "Gravity Touch"), a feature phone also released in June 2010
 Samsung Gravity Smart, an Android smartphone released June 22, 2011
 Samsung Gravity TXT, a feature phone released in August 2011

Gravity