Bootstrap 2 vs. Bootstrap 3 @media Comparison
Large Devices:Desktops
Bootstrap 2 >= 1200px
Bootstrap 3 >= 1200px
Medium devices
Bootstrap 2 >= 768px and <= 979px
Bootstrap 3 >= 992px
Small Devices:Tablets
Bootstrap 2 <= 767px
Bootstrap 3 >= 768px
Extra Small Devices
Bootstrap 2 <= 480px
Bootstrap 3 < 768px
Twitter Bootstrap 2 widths:
/* Large desktop */
@media (min-width: 1200px) { ... }
/* Portrait tablet to landscape and desktop */
@media (min-width: 768px) and (max-width: 979px) { ... }
/* Landscape phone to portrait tablet */
@media (max-width: 767px) { ... }
/* Landscape phones and down */
@media (max-width: 480px) { ... }
Bootstrap 2 @media Documentation is found here
Bootstrap 3 @media Documentation is found here