1. Introduction
This manual provides detailed instructions for the SERVO F21 Slide 4G LTE Button Smartphone. Please read this manual carefully before using your device to ensure safe and optimal performance. Keep this manual for future reference.
2. Package Contents
Ensure all items are present in the package:
- 1x SERVO F21 Slide Phone
- 1x Type-C Charging Cable
- 1x User Manual (this document)
- 1x Card Removal Pin
- 1x Retail Box
3. Device Layout and Buttons
Familiarize yourself with the physical layout and buttons of your SERVO F21 Slide smartphone.
- Volume Button + / -: Adjust the device volume.
- Flashlight Shortcut Button: Quickly activate the flashlight.
- Power Button: Press and hold to power on/off or restart. Short press to lock/unlock the screen.
- Answer Button: Used to accept incoming calls.
- Slide Mechanism: The phone features a classic slide design to reveal the physical keypad.
4. Setup Guide
4.1. SIM Card and Memory Card Installation
The SERVO F21 Slide supports two Nano SIM cards and one TF (Micro SD) memory card for expanded storage.
- Locate the SIM/memory card tray on the side of the device.
- Use the provided card removal pin to eject the tray.
- Carefully place your Nano SIM cards into the designated SIM1 and SIM2 slots.
- Insert your TF memory card into its dedicated slot.
- Gently push the tray back into the device until it clicks into place.
4.2. Initial Charging
Before first use, it is recommended to charge the phone for 3-5 hours. Use the provided Type-C charging cable and a charger that supports 5V1A output for optimal charging.
5. Operating Instructions
5.1. Power On/Off
To power on the device, press and hold the Power Button until the screen lights up. To power off, press and hold the Power Button, then select "Power off" from the options.
5.2. Basic Navigation and Keypad Usage
The SERVO F21 Slide combines a touch screen with a physical keypad. Slide the screen upwards to reveal the keypad for traditional dialing and typing. The physical buttons provide clear feedback and reduce accidental touches.
5.3. Network Connectivity
- 4G LTE: The phone supports 4G LTE high-speed network for fast internet access.
- Wi-Fi: Connect to available Wi-Fi networks for internet access. You can also use the phone as a Wi-Fi hotspot to share your internet connection with other devices.
- Bluetooth: Pair with Bluetooth devices such as headphones or speakers.
5.4. Camera Functions
The phone is equipped with a 2MP rear camera and a 2MP front camera, allowing you to capture photos and videos. Open the camera application to access these features.
5.5. Multimedia and Applications
- Audio/Video Player: Use the built-in players to enjoy your media files.
- FM Radio: Listen to local radio stations even without an internet connection.
- Google Play Store: Download and install a wide range of applications and games from the Google Play Store.
5.6. Flashlight
The device includes a flashlight function that can be quickly activated using the dedicated shortcut button on the side.
6. Maintenance
- Battery Care: To prolong battery life, avoid extreme temperatures and do not let the battery completely drain frequently. Use only approved chargers.
- Cleaning: Use a soft, lint-free cloth to clean the screen and body of the phone. Avoid using harsh chemicals or abrasive materials.
- Storage: When not in use for extended periods, store the phone in a cool, dry place.
7. Troubleshooting
| Problem | Possible Cause / Solution |
|---|---|
| Phone does not turn on after charging. | If the phone has not been used for a long time, the battery may be deeply discharged. Charge the phone for 3-5 hours using the provided Type-C cable and a 5V1A charger. |
| No network connection / Cannot make calls. |
|
| Applications are slow or crashing. |
|
| Wi-Fi or Bluetooth connectivity issues. |
|
7.1. Tracking Your Package
If you need to track your package, you can visit the official Cainiao tracking website and enter your parcel number.
Tracking URL: https://global.cainiao.com/
8. Specifications
| Feature | Specification |
|---|---|
| Model | F21 Slide |
| Brand | SERVO |
| CPU Model | MTK6737 |
| Operating System | Android 8.1 Version |
| Display Size | 3.0 inch HD Screen |
| Display Resolution | 480x320 |
| Screen Type | Normal Screen, IPS |
| RAM | 2GB |
| ROM | 16GB (expandable with TF card) |
| SIM Card Quantity | 2 Nano SIM cards |
| Memory Card Type | Dedicated slot (TF card) |
| Rear Camera Pixel | 2 MP |
| Front Camera Pixel | 2 MP |
| Battery Capacity | 2000mAh (Not Detachable) |
| Charging Interface Type | Type-C |
| Bluetooth Version | 4.0 |
| Wi-Fi | Yes |
| NFC | No |
| 3.5mm Headphone Port | Yes |
| GPS Navigation | Yes |
| Phone Dimensions | 136 x 52 x 19 mm (5.35 x 2.05 x 0.74 inches) |
| Phone Weight | 135g |
| Supported Languages | Arabic, Polish, German, Russian, French, Korean, Portuguese, Japanese, Turkish, Spanish, Italian, English |
| Certifications | CE, FCC |
8.1. Network Bands
- 2G GSM: Quad Band (B2(1900)/B3(1800)/B5(850)/B8(900))
- 3G WCDMA: (B1(2100)/B2(1900)/B4(1700)/B5(850)/B8(900))
- 4G TDD: (B38/40/41)
- 4G FDD: (B1/2/3/4/5/7/8/20/28AB)
Note: Due to network frequency band compatibility, this mobile phone may not function normally in Colombia, India, Türkiye, Chile, Azerbaijan, Tanzania, and Australia. Please verify compatibility with your local network provider before use.
9. User Tips
- Unlocked Device: The SERVO F21 Slide is an Android smartphone and is typically sold as an unlocked device, meaning it should work with compatible GSM carriers. Always confirm with your carrier.
- Compact Design: The phone's closed dimensions are approximately 136mm (height) x 52mm (width) x 19mm (thickness), making it compact and easy to carry.
- Battery Optimization: For best battery performance, avoid running too many apps in the background and adjust screen brightness.
- Software Updates: Regularly check for system updates to ensure optimal performance and security.
10. Warranty and Support
For detailed warranty information and further support, please refer to the official user manual PDF provided by the manufacturer. A digital version of the user manual can be found at: User Manual (PDF).
For technical assistance or service inquiries, please contact the seller or manufacturer's customer support channels.
