| Apple iPhone 4 |
Xiaomi Redmi Note 9 Pro |
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| Hardware and OS | Apple iPhone 4 | Xiaomi Redmi Note 9 Pro |
| Operating system | iOS 4, upgradable to iOS 7.1.2 | Android 10.0; MIUI 11 |
| Processor | 1.0 GHz Cortex-A8 | Octa-core (2x2.3 GHz Kryo 465 Gold & 6x1.8 GHz Kryo 465 Silver) |
| Chipset | Apple A4 (45 nm) | Qualcomm SM7125 Snapdragon 720G (8 nm) |
| GPU | PowerVR SGX535 | Adreno 618 |
| Internal memory | 8/16/32 GB, 512 MB RAM | 64GB 4GB RAM, 128GB 6GB RAM |
| External memory | No | microSDXC (dedicated slot) |
| Display | Apple iPhone 4 | Xiaomi Redmi Note 9 Pro |
| Type | LED-backlit IPS LCD | IPS LCD |
| Size | 3.5" inc | 6.67" inc |
| Resolution | 640 x 960 px | 1080 x 2400 px |
| Protection | Corning Gorilla Glass, oleophobic coating | Corning Gorilla Glass 5 |
| Touchscreen | capacitive touchscreen | capacitive touchscreen |
| Screen-to-Body Ratio | 54.0% | 84.5% |
| Display area | 36.5 cm2 | 107.4 cm2 |
| Display aspect ratio | 3:2 (height:width) | 20:9 (height:width) |
| Pixel Density | 330 PPI | 395 PPI |
| Colors | 16M | 16M |
| Other | 450 nits typ. brightness (advertised) | |
| Connectivity | Apple iPhone 4 | Xiaomi Redmi Note 9 Pro |
| 2G Network | GSM 850 / 900 / 1800 / 1900 | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network | HSDPA 850 / 900 / 1900 / 2100 | |
| 4G Network | LTE band 1(2100), 3(1800), 5(850), 8(900), 40(2300), 41(2500) | |
| Wi-Fi | Wi-Fi 802.11 b/g/n, hotspot | Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, hotspot |
| Network | GSM / HSPA | GSM / HSPA / LTE |
| SIM card | Micro-SIM | Dual SIM (Nano-SIM, dual stand-by) |
| Bluetooth | 2.1, A2DP | 5.0, A2DP, LE |
| Edge | Class 10 | Yes |
| GPRS | Class 10 | Yes |
| GPS | Yes, with A-GPS | Yes, with A-GPS, GLONASS, GALILEO, BDS, NavIC |
| Speed | HSPA 7.2/5.76 Mbps | HSPA 42.2/5.76 Mbps, LTE-A |
| USB | 2.0 | 2.0, Type-C 1.0 reversible connector |
| Camera | Apple iPhone 4 | Xiaomi Redmi Note 9 Pro |
| Main camera | 5 MP, Single | 48 MP, Quad |
| Specs | 5 MP, f/2.8, 1/3.2', 1.75µm, AF | 48 MP, f/1.8, (wide), 1/2.25", 0.8µm, PDAF -8 MP, f/2.2, 13mm (ultrawide), 1/4.0", 1.12µm -5 MP, f/2.4, (macro), 1.12µm -2 MP, f/2.4, (depth) |
| Features | LED flash, HDR | LED flash, HDR, panorama |
| Video | 720p@30fps | 2160p@30fps, 1080p@30/60/120fps, 720p@960fps, gyro-EIS |
| Selfie camera | 0.3 MP, Single | 16 MP, Single |
| Multimedia | Apple iPhone 4 | Xiaomi Redmi Note 9 Pro |
| 3.5 mm Jack | Yes | Yes |
| Radio | No | FM radio, recording |
| Design | Apple iPhone 4 | Xiaomi Redmi Note 9 Pro |
| Colors | Black, White | Aurora Blue, Glacier White, Interstellar Black |
| Body build | Front/back glass & aluminum frame | Glass front (Gorilla Glass 5), glass back (Gorilla Glass 5), plastic frame |
| Dimensions | 115.2 x 58.6 x 9.3 mm | 165.8 x 76.7 x 8.8 mm |
| Weight | 137 g | 209 g |
| Battery | Apple iPhone 4 | Xiaomi Redmi Note 9 Pro |
| Battery life | Stand by time- Up to 300 h (2G) / Up to 300 h (3G) Talking time- Up to 14 h (2G) / Up to 7 h (3G) Music play - Up to 40 h | |
| Battery capacity | 1420 mAh, Non-removable Li-Po | 5020 mAh, Non-removable Li-Po |
| Other | Apple iPhone 4 | Xiaomi Redmi Note 9 Pro |
| SAR | SAR - 1.17 W/kg (head), 1.11 W/kg (body), SAR EU - 0.93 W/kg (head), 0.74 W/kg (body) | |
| Release date | 2010, June | 2020, March 12 |
| Sensors | Accelerometer, gyro, proximity, compass | Fingerprint (side-mounted), accelerometer, gyro, proximity, compass , Infrared port |
