| Local Name | i637 Jack |
| Additional Information | For AT&T |
| Technology | GSM / HSPA |
| 3G Bands | HSDPA 850 / 1900 / 2100 |
| 2G Bands | GSM 850 / 900 / 1800 / 1900 |
| Speed | HSPA 3.6/0.384 Mbps |
| GPRS | Class 10 |
| EDGE | Class 10 |
| Announced | 2009, May |
| Status | Available. Released 2009, May |
| Dimensions | 117 x 61 x 12.7 mm (4.61 x 2.40 x 0.5 in) |
| Weight | 102.1 g (3.60 oz) |
| Keyboard | QWERTY |
| SIM | Mini-SIM |
| Display Type | TFT, 65K colors |
| Screen Size | 2.4 inches (~25.0% screen-to-body ratio) |
| Resolution | 320 x 240 pixels (~167 ppi pixel density) |
| OS | Microsoft Windows Mobile 6.1 Standard, upgradeable to Windows Mobile 6.5 |
| CPU | 528 MHz |
| Card Slot | microSD, up to 16 GB |
| Internal Memory | 256 MB RAM, 256 MB ROM |
| Primary Camera | 3.15 MP, 2048 x 1536 pixels |
| Video | Yes |
| Secondary Camera | No |
| Alert Types | Vibration; Downloadable polyphonic, MP3 ringtones |
| Loudspeaker | Yes |
| 3.5mm Jack | No |
| WLAN | Wi-Fi 802.11 b/g |
| Bluetooth | v2.0, A2DP |
| GPS | Yes, with A-GPS |
| Radio | No |
| USB | v2.0 |
| Messaging | SMS, MMS, Email, IM |
| Browser | WAP 2.0 / xHTML, HTML, Adobe Flash Lite |
| Java | Yes, MIDP 2.0 |
| Features Summary | Windows Media Player 10, Windows Live, Yahoo!, AOL, Microsoft Outlook Mobile, Pocket Office, Voice memo/dial, Predictive text input |
| Battery | Li-Ion 1480 mAh battery |
| Stand By | Up to 288 h |
| Talk Time | Up to 7 h |
| Colors | Yes |
| SAR US | 1.04 W/kg (head) 0.53 W/kg (body) |
