| Hardware and OS | Nokia Lumia 900 AT&T | |
| Operating system | Microsoft Windows Phone 7.5 Mango | |
| Processor | 1.4 GHz Scorpion | |
| Chipset | Qualcomm APQ8055 Snapdragon S2 | |
| Internal memory | 16GB 512MB RAM | |
| External memory | No | |
| GPU | Adreno 205 | |
| Display | Nokia Lumia 900 AT&T | other phones |
| Size | 4.3 inches, 52.6 cm2 | |
| Resolution | 480 x 800 pixels, 5:3 ratio | |
| Type | AMOLED capacitive touchscreen, 16M colors | |
| Protection | Corning Gorilla Glass | |
| Main Camera | Nokia Lumia 900 AT&T | other phones |
| Camera | 8 MP, AF | |
| Features | Carl Zeiss optics, dual-LED flash | |
| Video | 720p@30fps | |
| Selfie camera | Nokia Lumia 900 AT&T | other phones |
| Camera | 1.3 MP | |
| Video | VGA@30fps | |
| Connectivity | Nokia Lumia 900 AT&T | other phones |
| 2G Network | GSM 850 / 900 / 1800 / 1900 | |
| 3G Network | HSDPA 850 / 1900 / 2100 | |
| 4G Network | LTE band 4(1700/2100), 17(700) | |
| Bluetooth | 2.1, A2DP, EDR | |
| GPS | Yes, with A-GPS | |
| Speed | HSPA 21.1/5.76 Mbps, LTE Cat3 100/50 Mbps | |
| Technology | GSM / HSPA / LTE | |
| USB | microUSB 2.0 | |
| WLAN | Wi-Fi 802.11 b/g/n | |
| Multimedia | Nokia Lumia 900 AT&T | other phones |
| 3.5 mm Jack | Yes | |
| Loudspeaker | Yes | |
| Radio | Stereo FM radio, RDS | |
| Battery | Nokia Lumia 900 AT&T | other phones |
| Capacity | Non-removable Li-Ion 1830 mAh battery (BP-6EW) | |
| Stand-by | Up to 300 h | |
| Talk time | Up to 7 h | |
| Design | Nokia Lumia 900 AT&T | other phones |
| Colors | Matte black, cyan, pink | |
| Dimensions | 127.8 x 68.5 x 11.5 mm, 90 cc (5.03 x 2.70 x 0.45 in) | |
| Weight | 160 g (5.64 oz) | |
| SIM | Micro-SIM | |
| Features | Nokia Lumia 900 AT&T | other phones |
| Sensors | Accelerometer, gyro, proximity, compass | |
