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| Product | T-Mobile Sidekick II | HTC One  | T-Mobile Sidekick 3 | T-Mobile Sidekick LX (midnight blue) | T-Mobile Sidekick Slide |
| Price | $49.99 | $99.99 to $649.99 | $155.00 | Pricing is currently unavailable. | Pricing is currently unavailable. |
| CNET editors' rating | 3 stars | 4 stars | 3 stars | 3.5 stars | 3 stars |
| Average user rating | 3.5 stars | 4.5 stars | 3 stars | 3.5 stars | 3 stars |
| Release date | August 4, 2004 | April 19, 2013 | Info unavailable | October 17, 2007 | November 7, 2007 |
| Bottom line | T-Mobile's Sidekick II adds a built-in camera to its stellar e-mail, surfing, and IM abilities, but some annoying flaws remain. | A few quibbles notwithstanding, the powerhouse HTC One is a beautifully crafted, near-ideal smartphone. | The T-Mobile Sidekick 3 brings some notable additions, such as Bluetooth and an MP3 player, and continues to be a solid messaging device for the younger crowd; we just wish it had a better screen. | The T-Mobile Sidekick LX will continue to attract a legion of young fans with its fresh design and excellent messaging capabilities. We like the improved display, and the software update brings some much-needed additions to the features department. | With its slide-up screen, the T-Mobile Sidekick Slide offers a nice design alternative to the other Sidekick models. It's fine for first-time users but diehard Sidekick fans may prefer the more robust T-Mobile Sidekick LX. |
| Service Provider | T-Mobile | Info unavailable | T-Mobile | T-Mobile | T-Mobile |
| Cellular technology | GSM | Info unavailable | GSM | GSM | GSM |
| Band / mode | GSM 900/1800/1900 (Tri-Band) | Info unavailable | GSM 850/1800/1900 | GSM 850/900/1800/1900 (Quadband) | GSM 850/900/1800/1900 (Quadband) |
| Talk time | Up to 240 min | Info unavailable | Up to 270 min | Up to 408 min | Up to 354 min |
| Weight | 6.5 oz | 5.04 oz | 7 oz | 5.7 oz | 5.3 oz |
| Full specifications | Full specifications | Full specifications | Full specifications | Full specifications | Full specifications |
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| Pricing is currently unavailable. | Pricing is currently unavailable. |
T-Mobile Sidekick II compare
