1. Introduction
The Ulefone Armor 25T PRO 5G is a state-of-the-art rugged smartphone designed for extreme conditions and professional use. It integrates advanced features such as a thermal imaging scanner, a powerful camera system, and robust durability standards. This manual provides essential information for setting up, operating, maintaining, and troubleshooting your device.

Figure 1: Ulefone Armor 25T PRO 5G highlighting Thermal Imaging and Night Vision capabilities.
2. What's in the Box
Upon unboxing your Ulefone Armor 25T PRO 5G, please ensure all the following items are present:
- Ulefone Armor 25T PRO 5G Smartphone
- Charger (33W Fast Charger)
- USB Cable (Type-C)
- SIM Tray Ejector Tool
- Tempered Glass Screen Protector (pre-applied or included)
- User Manuals and Documentation
The package includes essential accessories for immediate use and protection.
3. Setup
3.1. SIM Card & MicroSD Card Installation
The device supports dual Nano-SIM cards and a MicroSD card for expandable storage up to 2TB. Use the provided SIM tray ejector tool to open the tray located on the side of the phone. Carefully place your Nano-SIM cards and/or MicroSD card into the designated slots, ensuring correct orientation. Reinsert the tray firmly until it clicks into place.
3.2. Initial Power On & Android 14 Setup
Press and hold the Power button on the side of the device until the Ulefone logo appears. Follow the on-screen prompts to complete the initial setup of Android 14, including language selection, Wi-Fi connection, Google account sign-in, and security settings.
3.3. Fingerprint & Face Unlock Setup
For enhanced security, configure your fingerprint and face unlock. Navigate to Settings > Security & privacy > Device unlock. Follow the instructions to register your fingerprints on the side-mounted sensor and set up face recognition for quick and secure access.
4. Operating the Device
4.1. Display
The Ulefone Armor 25T PRO features a large 6.78-inch FHD+ display with a 120Hz refresh rate for smooth visuals and responsive touch. The screen is protected by Corning Gorilla Glass Victus, offering enhanced scratch and drop resistance.

Figure 2: The vibrant 6.78-inch FHD+ display with 120Hz refresh rate.
4.2. Performance & Storage
Powered by the MediaTek Dimensity 6300 5G processor, the device offers efficient performance for multitasking and gaming. It comes with 12GB of RAM (6GB fixed + up to 6GB virtual RAM) and 256GB of internal storage, expandable via MicroSD card.

Figure 3: Memory and storage capabilities of the Ulefone Armor 25T PRO.
4.3. Battery & Charging
Equipped with a massive 6500mAh battery, the Armor 25T PRO provides extended usage time. It supports 33W wired fast charging, allowing for quick recharges, and 30W wireless charging for convenience. The device also features OTG reverse charging, enabling it to act as a power bank for other devices.

Figure 4: Details on the 6500mAh battery and charging capabilities.
4.4. Cameras
The Ulefone Armor 25T PRO features a versatile camera system:
- 50MP Main Camera: Equipped with ISOCELL Plus and Smart-ISO technology, capable of capturing detailed images and 4K video.
- 32MP Front Camera: Ideal for clear selfies and video calls.
- 64MP Night Vision Camera: Utilizes infrared LEDs for clear imaging in low-light or complete darkness.
- Thermal Imaging Camera: Integrated ThermoVue sensor (160x120 resolution) for detecting heat sources and displaying thermal images with temperature readings (-20°C to 550°C range). This is crucial for electrical, pipeline maintenance, and outdoor adventures.

Figure 5: Key features of the ThermoVue thermal imaging sensor.
The thermal camera is a powerful tool for various applications, from identifying heat leaks to spotting wildlife in the dark. The ThermoVue app provides various customization options for thermal imaging.
Video 1: Official product video showcasing the Ulefone Armor 25T PRO 5G Rugged Smartphone's features, including thermal imaging and ruggedness.
4.5. Rugged Features
The Armor 25T PRO is built to military-grade standards (MIL-STD-810H) and holds IP68/IP69K certifications, ensuring resistance to water (up to 1.5m for 30 mins), dust, drops, and extreme temperatures (-20°C to 55°C). It features a durable design with reinforced corners and a grippy texture.

Figure 6: The Ulefone Armor 25T PRO's IP68/IP69K and MIL-STD-810H certifications for extreme durability.
4.6. Connectivity
The device supports dual 5G/4G LTE networks for fast and stable connections. It also includes NFC for contactless payments, Wi-Fi, GPS (GPS+GLONASS+BDS+Galileo), and OTG for connecting external USB devices.
5. Maintenance
To ensure the longevity and optimal performance of your Ulefone Armor 25T PRO 5G, follow these maintenance guidelines:
- Cleaning: Use a soft, damp cloth to clean the device. Avoid harsh chemicals or abrasive materials. For water exposure, ensure all ports are dry before charging.
- Software Updates: Regularly check for and install system updates to ensure your device has the latest features, security patches, and performance improvements.
- Storage Management: Periodically clear unnecessary files and applications to maintain optimal performance. Utilize the 2TB MicroSD expansion slot for large media files.
- Battery Care: Avoid extreme temperatures when charging or using the device. Do not fully drain the battery frequently.
6. Troubleshooting
If you encounter any issues with your Ulefone Armor 25T PRO 5G, refer to the following common solutions:
| Issue | Possible Solution |
|---|---|
| Device Freezing/Unresponsive | Perform a forced restart by holding the Power button for 10-15 seconds. Ensure sufficient RAM is available; close background apps. |
| Thermal Camera Freezing | Update the system software. Close other demanding applications running in the background. |
| Network Connectivity Issues | Check SIM card insertion. Verify network settings (APN, preferred network type). Restart the device. Ensure compatibility with your carrier (Note: Not compatible with AT&T, Cricket Wireless, Verizon, Sprint, or Boost Mobile CDMA networks). |
| Battery Draining Quickly | Adjust screen brightness, disable unnecessary features (GPS, Wi-Fi, Bluetooth when not in use). Limit background app activity. |
| Night Vision Camera Brightness | The night vision camera may automatically adjust screen brightness to maximum. This is a design characteristic and cannot be changed via settings. |
For persistent issues, please contact Ulefone customer support.
7. Specifications
| Feature | Specification |
|---|---|
| Model | Ulefone Armor 25T PRO |
| Operating System | Android 14 |
| Processor | MTK Dimensity 6300 Dual 5G |
| RAM | 12GB (6GB physical + up to 6GB virtual) |
| Internal Storage | 256GB UFS 2.1 |
| Expandable Storage | Up to 2TB MicroSD |
| Display | 6.78-inch FHD+ (1080x2460) IPS LCD, 120Hz Refresh Rate, Corning Gorilla Glass Victus |
| Main Camera | 50MP (1/1.31" Ultra-Large Sensor) |
| Front Camera | 32MP |
| Night Vision Camera | 64MP with IR LEDs |
| Thermal Imaging | ThermoVue Sensor (160x120 resolution), -20°C to 550°C range |
| Battery Capacity | 6500mAh |
| Wired Charging | 33W Fast Charging |
| Wireless Charging | 30W Wireless Charging, Wireless Reverse Charging |
| Durability | IP68/IP69K, MIL-STD-810H Certified |
| Connectivity | Dual 5G/4G LTE, Wi-Fi, Bluetooth, NFC, GPS, OTG |
| Dimensions | 7.83 x 4.25 x 2.83 inches |
| Item Weight | 1.61 pounds |
8. Warranty and Support
The Ulefone Armor 25T PRO 5G comes with a one-year warranty from the date of purchase. This warranty covers manufacturing defects and issues arising from normal use. Please retain your proof of purchase for warranty claims.
For technical support, warranty inquiries, or service requests, please contact Ulefone customer service through their official website or the contact information provided in your product packaging. When contacting support, please have your device model number and purchase details ready.
For additional resources and FAQs, visit the official Ulefone website: www.ulefone.com





