| Hardware and OS | BenQ-Siemens P51 | vivo Y11 |
| Operating system | Microsoft Windows Mobile 5.0 PocketPC | Android 4.4.4 (KitKat) |
| Processor | 32-bit Intel XScale PXA272 416 MHz | Quad-core 1.3 GHz Cortex-A7 |
| Chipset | | Mediatek MT6582М |
| GPU | | Mali-400MP2 |
| Internal memory | 64MB RAM, 192MB ROM | 4 GB, 512 MB RAM |
| External memory | MMC/SDIO | microSD, up to 256 GB (dedicated slot) |
| Display | BenQ-Siemens P51 | vivo Y11 |
| Type | TFT resistive touchscreen, 256K colors | IPS LCD |
| Size | 2.8 inches, 42 x 57 mm, 24.3 cm2 | 4" inc |
| Resolution | 240 x 320 pixels, 4:3 ratio | 480 x 800 px |
| Touchscreen | | capacitive touchscreen |
| Screen-to-Body Ratio | | 59.2% |
| Display area | | 45.5 cm2 |
| Display aspect ratio | | 5:3 (height:width) |
| Pixel Density | | 233 PPI |
| Colors | | 16M |
| Main Camera | BenQ-Siemens P51 | vivo Y11 |
| Camera | 1.3 MP | |
| Video | QCIF | |
| Selfie camera | BenQ-Siemens P51 | vivo Y11 |
| Camera | No | |
| Connectivity | BenQ-Siemens P51 | vivo Y11 |
| 2G Network | GSM 850 / 900 / 1800 / 1900 | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| Wi-Fi | | Wi-Fi 802.11 b/g/n, Wi-Fi Direct, hotspot |
| Network | | GSM / HSPA |
| Technology | GSM | |
| SIM card | | Dual SIM (Micro-SIM, dual stand-by) |
| Bluetooth | 1.2, A2DP | 4.0, A2DP, EDR |
| WLAN | Wi-Fi 802.11b/g, VoIP via Wi-Fi | |
| Edge | No | Yes |
| GPRS | Class 10 | Yes |
| GPS | Yes | Yes, with A-GPS |
| Speed | | HSPA 21.1/7.2 Mbps |
| USB | Proprietary | microUSB 2.0, USB Host |
| Camera | BenQ-Siemens P51 | vivo Y11 |
| Main camera | | 5 MP, Single |
| Specs | | 5 MP, AF |
| Features | | LED flash |
| Video | | 1080p@30fps |
| Selfie camera | | 2 MP, Single |
| Multimedia | BenQ-Siemens P51 | vivo Y11 |
| Alert types | Vibration; Downloadable polyphonic, MP3 ringtones | |
| Loudspeaker | Yes | |
| 3.5 mm Jack | No | Yes |
| Radio | No | FM radio |
| Design | BenQ-Siemens P51 | vivo Y11 |
| SIM | Mini-SIM | |
| Keyboard | QWERTY | |
| Colors | | White, Black |
| Dimensions | 122 x 60 x 20 mm, 130 cc (4.80 x 2.36 x 0.79 in) | 123 x 62.5 x 8.8 mm |
| Weight | 170 g (6.00 oz) | 124 g |
| Battery | BenQ-Siemens P51 | vivo Y11 |
| Capacity | Removable Li-Ion 1370 mAh battery | |
| Stand-by | Up to 150 h | |
| Talk time | Up to 4 h | |
| Battery capacity | | 1700 mAh, Removable Li-Po |
| Battery life | | Talking time- Up to 11 h (2G) / Up to 8 h (3G)
Music play - Up to 34 h |
| Other | BenQ-Siemens P51 | vivo Y11 |
| Release date | | 2014, Q4 |
| Sensors | | Accelerometer, proximity , Infrared port |
