| Hardware and OS | AT&T Mustang | Oppo A3s |
| Operating system | Windows Mobile 6 Standard | Android 8.1 (Oreo); ColorOS 5.1 |
| Processor | Marvell Bulverde 416 MHz | Octa-core 1.8 GHz Cortex-A53 |
| Chipset | | Qualcomm SDM450 Snapdragon 450 (14 nm) |
| GPU | | Adreno 506 |
| Internal memory | 64MB RAM, 128MB ROM | 16 GB, 2 GB RAM |
| External memory | microSD (dedicated slot) | microSD, up to 256 GB (dedicated slot) |
| Display | AT&T Mustang | Oppo A3s |
| Type | TFT, 256K colors | IPS LCD |
| Size | 2.2 inches, 15.0 cm2 | 6.2" inc |
| Resolution | 240 x 320 pixels, 4:3 ratio | 720 x 1520 px |
| Touchscreen | | capacitive touchscreen |
| Screen-to-Body Ratio | | 81.2% |
| Display area | | 95.9 cm2 |
| Display aspect ratio | | 19:9 (height:width) |
| Pixel Density | | 271 PPI |
| Colors | | 16M |
| Main Camera | AT&T Mustang | Oppo A3s |
| Camera | 1.3 MP | |
| Video | Yes | |
| Selfie camera | AT&T Mustang | Oppo A3s |
| Camera | No | |
| Connectivity | AT&T Mustang | Oppo A3s |
| 2G Network | GSM 850 / 900 / 1800 / 1900 | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network | HSDPA 850 / 1900 | HSDPA 850 / 900 / 2100 |
| 4G Network | | LTE |
| Technology | GSM / HSPA | |
| Wi-Fi | | Wi-Fi 802.11 b/g/n, WiFi Direct, hotspot |
| Network | | GSM / HSPA / LTE |
| WLAN | No | |
| SIM card | | Dual SIM (Nano-SIM, dual stand-by) |
| Bluetooth | 1.2, A2DP | 4.2, A2DP, LE |
| Edge | | Yes |
| GPRS | | Yes |
| GPS | No | Yes, with A-GPS |
| Speed | HSPA 1.8 Mbps | HSPA 42.2/5.76 Mbps, LTE-A (2CA) Cat6 300/50 Mbps |
| USB | 1.1 | microUSB 2.0, USB On-The-Go |
| Camera | AT&T Mustang | Oppo A3s |
| Main camera | | 13 MP, Dual |
| Specs | | 13 MP, f/2.2, AF
-2 MP, f/2.4, depth sensor |
| Features | | LED flash, HDR, panorama |
| Video | | 1080p@30fps |
| Selfie camera | | 8 MP, Single |
| Multimedia | AT&T Mustang | Oppo A3s |
| Loudspeaker | Yes | |
| 3.5 mm Jack | Yes | Yes |
| Radio | No | FM radio |
| Design | AT&T Mustang | Oppo A3s |
| Body | Dual slide design | |
| SIM | Mini-SIM | |
| Keyboard | QWERTY | |
| Colors | Black | Red, Dark Purple |
| Dimensions | 102 x 50 x 19.9 mm (4.02 x 1.97 x 0.78 in) | 156.2 x 75.6 x 8.2 mm |
| Weight | 110 g (3.88 oz) | 168 g |
| Battery | AT&T Mustang | Oppo A3s |
| Capacity | Removable Li-Po 1320 mAh battery | |
| Stand-by | Up to 240 h | |
| Talk time | Up to 3 h | |
| Battery capacity | | 4230 mAh, Non-removable Li-Ion |
| Other | AT&T Mustang | Oppo A3s |
| Release date | | 2018, July |
| Sensors | | Accelerometer, proximity, compass |
