Side-by-side technical data
Ulefone Armor 28 Ultra Thermal vs Ulefone Armor 21
Comparison between Ulefone Armor 28 Ultra Thermal and Ulefone Armor 21: camera, battery, fast charging, display, performance and colors, side by side. More phones from Ulefone.
The verdict
Your pick: Ulefone Armor 28 Ultra Thermal, ahead on Design & display, Performance & hardware, Camera, Connectivity and Battery & charging.
| Category | Armor 28 Ultra Thermal | Armor 21 |
|---|---|---|
| Design & display | 6.7 | 5.6 |
| Performance & hardware | 9.5 | 5.2 |
| Camera | 7.5 | 5.0 |
| Connectivity | 7.7 | 6.1 |
| Battery & charging | 9.8 | 6.3 |
Which one is for you?
Ulefone Armor 28 Ultra Thermal, if you care about…
- Battery Capacity
- 10,600 mAh
- against 9,600 mAh
- RAM Capacity
- 16 GB
- against 8 GB
- Wi-Fi Standards
- Wi-Fi 802.11a/b/g, Wi-Fi 4 (802.11n), Wi-Fi 5 (802.11ac), Wi-Fi 6 (802.11ax), Wi-Fi 7 (802.11be)
- against Wi-Fi 4 (802.11n), Wi-Fi 5 (802.11ac), Wi-Fi 802.11a/b/g
- Storage Type
- UFS 4.0
- against UFS 2.1
Ulefone Armor 21, if you care about…
- Weight
- 400 g
- against 450 g
- Body Thickness
- 18.1 mm
- against 19.4 mm
- Rugged Build
- Yes
- against No
Specification comparison
Performance
| Specification | Armor 28 Ultra Thermal | Armor 21 |
|---|---|---|
| Processor Model | MediaTek Dimensity 9300+ | MediaTek Helio G99 |
| Processor Process Size | 4 nm Best value | 6 nm |
| Graphics GPU | Immortalis-G720 MC12 | Mali-G57 MC2 |
| Storage Type | UFS 4.0 Best value | UFS 2.1 |
| Maximum CPU Clock | 3.25 GHz Best value | 2.2 GHz |
| Maximum Storage Capacity | 1,000 GB Best value | 256 GB |
| AnTuTu Score | — | 411,900 |
| Geekbench 6 Single-Core | — | 729 |
| Geekbench 6 Multi-Core | — | 1,979 |
| CPU Description | Octa-core processor with 1x3.25 GHz Cortex-X4, 3x2.85 GHz Cortex-X4, and 4x2.0 GHz Cortex-A720 cores. | Octa-core CPU with 2 Cortex-A76 cores at 2.2 GHz and 6 Cortex-A55 cores at 2.0 GHz. |
| Processor Type | Octa-Core | Octa-Core |
| 64-Bit Processor | — | Yes |
| RAM Capacity | 16 GB Best value | 8 GB |
| RAM Type | — | LPDDR4X |
| Expandable Storage | Yes | Yes |
| AnTuTu version | — | v10 |
Design
| Specification | Armor 28 Ultra Thermal | Armor 21 |
|---|---|---|
| Body Colors | Black | Black |
| Body Thickness | 19.4 mm | 18.1 mm Best value |
| Body Width | 83.6 mm | 81.6 mm |
| Body Height | 174.2 mm | 176 mm |
| Weight | 450 g | 400 g Best value |
| Usable Surface | 75.5 % Best value | 72.6 % |
| Body Materials | — | Polycarbonate |
| Resistance Features | IP68, IP69K, MIL-STD-810H, Drop Resistant Up to 2 m | IP68, IP69K, MIL-STD-810H, Drop Resistant Up to 1.5 m |
| Waterproof Depth | 2 m Best value | 1.5 m |
| Drop Resistance Class | — | A |
| Repairability Class | — | C |
| Rugged Build | No | Yes Best value |
| Drop Test Count | — | 270 |
Battery
| Specification | Armor 28 Ultra Thermal | Armor 21 |
|---|---|---|
| Battery Efficiency Rating | — | B |
| Battery Capacity | 10,600 mAh Best value | 9,600 mAh |
| Battery Type | Li-Ion | Li-Polymer |
| Fast Charge Power | 120 W Best value | 33 W |
| Battery Features | Fast Charging, Wireless Charging, Reverse Charging, Reverse Wireless Charging Best value | Fast Charging, Non-Removable, Battery Level Indicator, Charger Included, Rechargeable |
| Battery Endurance | — | 89 h 48 min |
| Wireless charging power | 50 W | — |
| Charge cycles | — | 1,000 |
Display
| Specification | Armor 28 Ultra Thermal | Armor 21 |
|---|---|---|
| Display Aspect Ratio | 20:9 | 20:9 |
| Display Technology | AMOLED Best value | IPS LCD |
| Peak Display Brightness | 2,200 nits | — |
| Display Diagonal | 6.67″ Best value | 6.58″ |
| Display Horizontal Resolution | 1,080 px | 1,080 px |
| Display Vertical Resolution | 2,460 px Best value | 2,408 px |
| Display Pixel Density | 395 ppi | 401 ppi Best value |
| Display Refresh Rate | 120 Hz | 120 Hz |
| Touch Sampling Rate | — | 240 Hz |
| Display Features | Secondary Display, AMOLED, Gorilla Glass Victus | Mohs Level 4, Water Drop Notch, Capacitive Touch, Multi-Touch, Scratch Resistant, Color LED Notifications, 120Hz |
Sensors
| Specification | Armor 28 Ultra Thermal | Armor 21 |
|---|---|---|
| Fingerprint Sensor Placement | Side | Side |
Sensor
| Specification | Armor 28 Ultra Thermal | Armor 21 |
|---|---|---|
| Sensor Features | Fingerprint Sensor, Accelerometer, Gyroscope, Proximity Sensor, Compass, Barometer | Fingerprint Sensor, Accelerometer, Proximity Sensor, Light Sensor, Compass, Gyroscope, Gravity Sensor, Barometer |
Software
| Specification | Armor 28 Ultra Thermal | Armor 21 |
|---|---|---|
| Operating System | Android 15 | Android 13 |
| OS Family | Android | Android |
| OS Version | 15 Best value | 13 |
| Google Services | — | Yes |
Connectivity
| Specification | Armor 28 Ultra Thermal | Armor 21 |
|---|---|---|
| SIM Configurations | Dual Nano-SIM | Dual Nano-SIM, Dual SIM Dual Standby |
| Cellular Bands | 2G GSM 850, 2G GSM 900, 2G GSM 1800, 2G GSM 1900, 3G UMTS 800, 3G UMTS B850, 3G UMTS B900, 3G UMTS 1700 AWS, 3G UMTS 1900, 3G UMTS 2100, 4G LTE B1, 4G LTE B2, 4G LTE B3, 4G LTE B4, 4G LTE B5, 4G LTE B7, 4G LTE B8, 4G LTE B12, 4G LTE B13, 4G LTE B17, 4G LTE B18, 4G LTE B19, 4G LTE B20, 4G LTE B25, 4G LTE B26, LTE B28, 4G LTE B34, 4G LTE B38, 4G LTE B39, 4G LTE B40, 4G LTE B41, 4G LTE B66, 4G LTE B71, 5G NR n1, 5G NR n2, 5G NR n3, 5G NR n5, 5G NR n7, 5G NR n8, 5G NR n20, 5G NR n25, 5G NR n28, 5G NR n38, 5G NR n40, 5G NR n41, 5G NR n66, 5G NR n71, 5G NR n77, 5G NR n78, 5G NR n79 | 2G GSM 850, 2G GSM 900, 2G GSM 1800, 2G GSM 1900, 2G CDMA BC0, 2G CDMA BC1, 4G LTE B1, 4G LTE B2, 4G LTE B3, 4G LTE B4, 4G LTE B5, 4G LTE B7, 4G LTE B8, 4G LTE B12, 4G LTE B17, 4G LTE B18, 4G LTE B19, 4G LTE B20, 4G LTE B28A, 4G LTE B28B, 4G LTE B34, 4G LTE B38, 4G LTE B39, 4G LTE B40, 4G LTE B41, 4G LTE B66, 3G UMTS B1, 3G UMTS B2, 3G UMTS B4, 3G UMTS B5, 3G UMTS B8, 3G UMTS 1700 AWS |
| Cellular Technologies | GSM, CDMA, HSPA, LTE, 5G Best value | GSM, HSPA, UMTS, LTE |
| Wi-Fi Standards | Wi-Fi 802.11a/b/g, Wi-Fi 4 (802.11n), Wi-Fi 5 (802.11ac), Wi-Fi 6 (802.11ax), Wi-Fi 7 (802.11be) Best value | Wi-Fi 4 (802.11n), Wi-Fi 5 (802.11ac), Wi-Fi 802.11a/b/g |
| Wi-Fi Features | Tri-Band Best value | Dual Band, Wi-Fi Hotspot, Wi-Fi Direct, Wi-Fi Display |
| Bluetooth Version | Bluetooth 5.4 Best value | Bluetooth 5.2 |
| Bluetooth Profiles | A2DP, LE | A2DP, LE |
| Navigation Systems | GPS, Galileo, GLONASS, QZSS, BeiDou, NavIC Best value | GPS, A-GPS, GLONASS, Galileo, BeiDou |
| Connectivity Features | 3.5 mm Audio Jack, Infrared, NFC, FM Radio, USB Type-C, USB OTG, USB 3.2 Gen 2, DisplayPort output | USB Charging, USB Mass Storage, USB OTG, USB Host 2.0, USB Type-C, NFC, 3.5 mm Audio Jack, FM Radio, Computer Sync, OTA Sync, Tethering, Infrared, VoLTE, USB 2.0 |
| USB Version | USB 3.2 Gen 2 Best value | USB 2.0 |
| Max. download speed | — | 650 Mbps |
| Max. upload speed | — | 150 Mbps |
Audio
| Specification | Armor 28 Ultra Thermal | Armor 21 |
|---|---|---|
| Audio Features | A2DP, LE, Loudspeaker | A2DP, LE, Loudspeaker |
Related comparisons
- Ulefone Armor 28 Ultra Thermal vs Honor 200 Pro
- Ulefone Armor 28 Ultra Thermal vs Asus ROG Phone 9 FE
- Ulefone Armor 28 Ultra Thermal vs Samsung Galaxy S25
- Ulefone Armor 28 Ultra Thermal vs OnePlus Ace 6T
- Ulefone Armor 21 vs Fossibot F102
- Ulefone Armor 21 vs Wiko 5G
- Ulefone Armor 21 vs Oukitel WP33 Pro
- Ulefone Armor 21 vs Doogee V11
