1. Introduction
This manual provides essential information for the safe and efficient operation of your Meizu mblu 21 smartphone. Please read it thoroughly before using the device.
The Meizu mblu 21 features a Prism Edge Design with a radiant gradient and a large immersive 6.79-inch HD display. It is equipped with a 13MP main camera and an 8MP front camera, powered by Android 14. The device includes a 4900mAh battery for extended use and supports 4G LTE connectivity, Dual-Band Wi-Fi, and Bluetooth 5.0.

Figure 1.1: Front and back view of the Meizu mblu 21 smartphone in White Diamond color.
2. What's in the Box
Verify that all items are present in the package:
- Meizu mblu 21 Smartphone
- Power Adapter
- USB Cable
- SIM Ejector Tool
- Quick Start Guide

Figure 2.1: Meizu mblu 21 smartphone alongside its power adapter.
3. Setup
3.1. Inserting SIM Cards and MicroSD Card
The Meizu mblu 21 supports Dual Nano SIM cards and a MicroSD card for expandable storage. Locate the SIM tray on the side of the device.
- Power off the device before inserting or removing SIM/MicroSD cards.
- Use the provided SIM ejector tool to open the SIM tray.
- Carefully place the Nano SIM cards and/or MicroSD card into the designated slots on the tray, ensuring correct orientation.
- Gently push the tray back into the device until it is flush.
3.2. Initial Power On and Setup Wizard
- Press and hold the Power button until the Meizu logo appears.
- Follow the on-screen instructions to complete the initial setup, including selecting your language, connecting to a Wi-Fi network, and setting up your Google account.
4. Operating Your Device
4.1. Display and Navigation
The 6.79-inch HD display features a 90Hz adaptive refresh rate for smooth visuals. Navigate the interface using touch gestures: tap, swipe, pinch-to-zoom.
4.2. Camera Functions
The device is equipped with a 13MP main camera and an 8MP front camera. Open the Camera application to capture photos and videos.
- 13MP Smart Camera: Ideal for capturing everyday moments with sharpness and true-to-life colors.
- 8MP Front Camera: Designed for clear selfies and video calls.
4.3. Security Features
- Side Unlock: A fast and secure fingerprint sensor integrated into the side power button for instant access.
- Smart Face Unlock: Use the front camera to unlock your device quickly and conveniently.
4.4. Connectivity
Your mblu 21 supports various connectivity options:
- 4G LTE: For mobile data connectivity. In the USA, this device is compatible with T-Mobile. Outside the USA, it works with any carrier worldwide.
- Dual-Band Wi-Fi: Supports both 2.4GHz and 5GHz bands for seamless internet access.
- Bluetooth 5.0: For connecting wireless accessories with improved energy efficiency.
- VoLTE HD Calls: Enjoy sharper, clearer voice calls over LTE networks.

Figure 4.1: Key technology features of the Meizu mblu 21, including Android 14, Dual-Band Wi-Fi, Bluetooth 5.0, and VoLTE.
5. Maintenance
5.1. Battery Care
The mblu 21 is equipped with a 4900mAh battery. To maximize battery lifespan:
- Avoid extreme temperatures.
- Use only the provided power adapter or certified compatible chargers.
- Avoid fully discharging the battery frequently.

Figure 5.1: Internal view of the Meizu mblu 21, showcasing the 4900mAh battery and internal components.
5.2. Cleaning Your Device
Use a soft, lint-free cloth to clean the screen and body of the phone. Avoid using harsh chemicals or abrasive materials.
5.3. Software Updates
Regularly check for and install software updates to ensure optimal performance and security. Updates can be found in the device's settings menu.
6. Troubleshooting
If you encounter issues with your Meizu mblu 21, try the following solutions:
- Device Not Responding: Press and hold the Power button for about 10-15 seconds to force a restart.
- Network Connectivity Issues:
- Ensure SIM card is properly inserted.
- Toggle Airplane Mode on and off.
- Check network settings (APN, preferred network type).
- Battery Draining Quickly:
- Close unused apps running in the background.
- Reduce screen brightness.
- Disable unnecessary features like GPS or Bluetooth when not in use.
- Performance Issues:
- Clear cache and data of problematic apps.
- Free up storage space.
- Consider a factory reset (Note: This will erase all data on your device. Back up important data first.).
7. Specifications
| Feature | Detail |
|---|---|
| Model Name | mblu 21 |
| Model Number | M416L |
| Operating System | Android 14 |
| Screen Size | 6.79 Inches |
| Memory Storage Capacity | 64 GB |
| RAM Memory Installed Size | 4 GB |
| Battery Capacity | 4900 Milliamp Hours |
| Main Camera | 13 MP |
| Front Camera | 8 MP |
| Wireless Carrier (USA) | T-Mobile |
| Cellular Technology | 4G LTE |
| Connectivity Technologies | 4G, Dual-Band Wi-Fi, Bluetooth 5.0 |
| Item Weight | 14 ounces |
| Package Dimensions | 7 x 4 x 2 inches |
| Color | White Diamond |
8. Warranty and Support
Your Meizu mblu 21 smartphone comes with a manufacturer's warranty. Please refer to the warranty card included in your product packaging for specific terms and conditions.
For technical support, service, or further inquiries, please contact Meizu customer support through their official channels. Contact information can typically be found on the manufacturer's website or in the product documentation.




