| Secret codes BLU J4 |
| Hard reset BLU J4 |
| Root BLU J4 |
| Unlock BLU J4 |
| Firmware BLU J4 |
| Developer Mode BLU J4 |
| Bypass Lock Screen BLU J4 |
| Remove a Google account BLU J4 |
| BLU J4 Factory Reset |
| Bypass FRP BLU J4 |
| Screenshot BLU J4 |
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OS: Android 8.1 Oreo (Go edition) CPU: Quad-core 1.3 GHz Cortex-A7 Display: 5.5" inc Camera: 8 MP,
Single |
| Hardware and OS BLU J4 | |
| Operating system: | Android 8.1 Oreo (Go edition) |
| Processor: | Quad-core 1.3 GHz Cortex-A7 |
| GPU: | Mali-400 |
| Internal memory: | 32GB 1GB RAM |
| External memory: | microSDXC |
| Display BLU J4 | |
| Type: | IPS LCD |
| Size: | 5.5" inc |
| Resolution: | 720 x 1440 px |
| Touchscreen: | capacitive touchscreen |
| Screen-to-Body Ratio: | 71.5% |
| Display area: | 78.1 cm2 |
| Display aspect ratio: | 18:9 (height:width) |
| Pixel Density: | 293 PPI |
| Colors: | 16M |
| Connectivity BLU J4 | |
| 2G Network: | 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 |
| SIM card: | Dual SIM (Nano-SIM, dual stand-by) |
| Bluetooth: | 4.1, A2DP, LE |
| Edge: | Yes |
| GPRS: | Yes |
| GPS: | Yes, with A-GPS |
| Speed: | HSPA 21.1/5.76 Mbps |
| USB: | microUSB 2.0 |
| Camera BLU J4 | |
| Main camera: | 8 MP, Single |
| Specs: | 8 MP, AF |
| Features: | LED flash |
| Video: | 720p@30fps |
| Selfie camera: | 8 MP, Single |
| Specs: | 8 MP |
| Video: | 720p@30fps |
| Multimedia BLU J4 | |
| 3.5 mm Jack: | Yes |
| Radio: | FM radio |
| Design BLU J4 | |
| Colors: | Blue, Black, Brown |
| Dimensions: | 151 x 72.3 x 10 mm |
| Weight: | 158 g |
| Battery BLU J4 | |
| Battery capacity: | 2200 mAh, Removable Li-Po |
| Other BLU J4 | |
| Release date: | 2019, October |
| Sensors: | Accelerometer |
 | Sushil kumar mal khatwe | April 01, 2022 |
| very good | ||
| Reply | ||
| GanBova | March 06, 2024 |
| Feature phones have a simple operating system, long battery life, durable build, physical keypad, and affordable price point. | ||
| Reply | ||
| Hlxlci | May 02, 2024 |
| Limited features, outdated technology, slow performance, small screen, low resolution. | ||
| Reply | ||
| Nud-Goqjqa | May 04, 2024 |
| Good phone with decent features overall. | ||
| Reply | ||
