| Local Name | Sidekick 4G |
| Additional Information | Also known as T-Mobile T839 Sidekick 4G |
| Technology | GSM / HSPA |
| 3G Bands | HSDPA 1700 / 2100 | HSDPA 2100 |
| 2G Bands | GSM 850 / 900 / 1800 / 1900 |
| Speed | HSPA 7.2/5.76 Mbps |
| Announced | 2011, March. Released 2011, April 20 |
| Status | Discontinued |
| Dimensions | 127 x 61 x 15 mm (5.0 x 2.40 x 0.59 in) |
| Weight | 162 g (5.71 oz) |
| Keyboard | QWERTY |
| SIM | Mini-SIM |
| Body | Optical trackpad |
| Display Type | Removable Li-Ion 1500 mAh battery |
| Screen Size | 3.5 inches, 34.9 cm2 (~45.0% screen-to-body ratio) |
| Resolution | 480 x 800 pixels, 5:3 ratio (~267 ppi density) |
| OS | Android 2.2 (Froyo) |
| Chipset | Hummingbird |
| CPU | 1.0 GHz Cortex-A8 |
| GPU | PowerVR SGX540 |
| Card Slot | microSDHC (dedicated slot), 2 GB included |
| Internal Memory | 1GB 512MB RAM |
| Loudspeaker | Yes |
| 3.5mm Jack | Yes |
| WLAN | Wi-Fi 802.11 b/g/n, DLNA, hotspot |
| Bluetooth | 3.0, A2DP |
| Radio | Nо |
| USB | microUSB 2.0 |
| Sensors | Accelerometer, proximity |
| Browser | HTML, Adobe Flash |
| Features Summary | T-Mobile TV, MP4/H.264 player, MP3/WAV/eAAC+ player, Organizer, ThinkFree Office document editor , PDF viewer, Voice memo, Predictive text input |
| Stand By | Up to 456 h |
| Talk Time | Up to 6 h 30 min |
| Colors | Matte black, Pearl magenta |
