1. Introduction
This manual provides essential information for setting up, operating, maintaining, and troubleshooting your new vivo Y21 5G smartphone. Please read this manual carefully to ensure proper usage and to maximize the device's performance and longevity.
2. What's in the Box
Upon unboxing your vivo Y21 5G, please verify that all the following items are included:
- vivo Y21 5G Smartphone
- Power Adapter
- USB Cable
- SIM Tray Ejector
- Phone Case
- Screen Protector (pre-applied or in box)
3. Device Layout
Familiarize yourself with the physical components of your vivo Y21 5G smartphone.

Figure 3.1: Front and back view of the vivo Y21 5G in Champagne Gold.

Figure 3.2: Right side view showing volume rocker and power button.

Figure 3.3: Bottom view showing USB Type-C port and speaker.
- Front Camera: Located at the top center of the display.
- Display: The main screen for interaction.
- Volume Buttons: On the right side, used to adjust media and call volume.
- Power Button: On the right side, below the volume buttons. Press and hold to power on/off or restart. A quick press locks/unlocks the screen.
- SIM/Memory Card Tray: On the left side.
- USB Type-C Port: At the bottom, for charging and data transfer.
- Speaker: At the bottom.
- Rear Cameras: Dual camera setup on the back.
4. Setup
4.1. Inserting SIM and Memory Cards
Your vivo Y21 5G supports dual SIM cards and a microSD card for expandable storage.
- Locate the SIM card tray on the left side of the phone.
- Insert the SIM ejector tool into the small hole on the tray and press firmly until the tray pops out.
- Place your Nano-SIM cards and/or microSD card into the designated slots on the tray, ensuring the gold contacts face down.
- Carefully push the tray back into the phone until it clicks into place.

Figure 4.1: SIM card tray location.
4.2. Initial Power On and Setup
- Press and hold the Power button until the vivo logo appears.
- Follow the on-screen prompts to select your language, region, and connect to a Wi-Fi network.
- Sign in with your Google account or create a new one to access Google services and the Play Store.
- Set up screen lock methods such as PIN, pattern, password, fingerprint, or face unlock for security.
5. Operating Your Device
5.1. Display Features
Your vivo Y21 5G features a 6.74-inch HD+ LCD display with a 120Hz refresh rate and 1200 Nits peak brightness for a smooth and clear viewing experience. It also includes TÜV Rheinland Low Blue Light Certification to reduce eye strain.

Figure 5.1: Display specifications and certifications.
5.2. Camera Usage
Capture high-quality photos and videos with the 50MP main rear camera and 5MP front camera.

Figure 5.2: Camera specifications.
- Open the Camera app from your home screen or app drawer.
- Swipe left or right to switch between different modes like Photo, Portrait, Video, and more.
- Tap the shutter button to take a photo or the record button to start/stop video recording.
- Use the toggle to switch between the front and rear cameras.
5.3. Battery Management
The vivo Y21 5G is equipped with a 6500 mAh battery and supports 44W FlashCharge for quick recharging.

Figure 5.3: Battery and charging capabilities.
- Use the provided 44W power adapter and USB cable for optimal charging speed.
- To check battery usage, go to Settings > Battery.
- Enable Battery Saver mode to extend battery life when needed.
5.4. Connectivity
- 5G Network: Your device supports 5G cellular technology. Ensure your SIM card and plan support 5G for high-speed data.
- Wi-Fi: Connect to wireless networks via Settings > Network & internet > Wi-Fi.
- Bluetooth: Pair with other Bluetooth devices (headphones, speakers) via Settings > Connected devices > Bluetooth.
- USB Type-C: Connect to a computer for file transfer or use with compatible accessories.
5.5. Security
Protect your device and data using the available security features:
- Fingerprint Unlock: Register your fingerprints via Settings > Security > Fingerprint.
- Face Unlock: Set up facial recognition via Settings > Security > Face.
- Screen Lock: Use PIN, pattern, or password for basic screen security.
6. Maintenance
6.1. Cleaning Your Device
- Use a soft, lint-free cloth to clean the screen and back panel.
- Avoid using harsh chemicals or abrasive materials.
- For ports, use a soft brush to gently remove dust.
6.2. Software Updates
Regularly check for and install software updates to ensure your device has the latest features, security patches, and performance improvements.
- Go to Settings > System > System update.
- Connect to a stable Wi-Fi network and ensure your battery is sufficiently charged before starting an update.
6.3. Storage Management
Your device comes with 128GB of internal storage. To manage storage effectively:
- Regularly delete unnecessary files, photos, and videos.
- Uninstall apps you no longer use.
- Utilize cloud storage services for backups.
- Consider using a microSD card for additional storage.
7. Troubleshooting
7.1. Common Issues and Solutions
- Device not turning on: Ensure the battery is charged. Connect to the charger for at least 15 minutes, then try powering on.
- Apps crashing or freezing: Close the app and reopen it. If the issue persists, clear the app's cache (Settings > Apps > [App Name] > Storage & cache > Clear cache).
- Poor network signal: Check if your SIM card is properly inserted. Move to an area with better network coverage. Restart your device.
- Battery draining quickly: Reduce screen brightness, close background apps, disable unnecessary features like GPS or Bluetooth when not in use.
7.2. Restarting Your Device
If your device is unresponsive, press and hold the Power button for approximately 10-15 seconds until the device restarts.
7.3. Factory Reset
A factory reset will erase all data from your phone and restore it to its original factory settings. Back up all important data before proceeding.
- Go to Settings > System > Reset options > Erase all data (factory reset).
- Follow the on-screen instructions to confirm the reset.
8. Specifications
Detailed technical specifications for the vivo Y21 5G smartphone:
| Feature | Specification |
|---|---|
| Brand | vivo |
| Model | Y21 5G |
| Operating System | OriginOS 6 |
| RAM | 4 GB |
| Internal Storage | 128 GB |
| CPU Model | Mediatek Dimensity 6300 |
| CPU Speed | 2.4 GHz |
| Display Size | 17.13 cm (6.74 inches) |
| Display Type | LCD |
| Display Resolution | 720 x 1600 Pixels |
| Rear Camera | 50 MP + 0.08 MP |
| Front Camera | 5 MP |
| Battery Capacity | 6500 Milliamp Hours |
| Charging | 44W FlashCharge |
| SIM Card Slot Count | Dual SIM |
| Cellular Technology | 5G |
| Connector Type | USB Type C |
| Dimensions | 16.7 x 7.7 x 0.8 Centimeters |
| Weight | 209 Grams |
| Color | Champagne Gold |
9. Warranty Information
Your vivo Y21 5G smartphone comes with a manufacturer's warranty:
- Device Warranty: 1 year from the date of purchase.
- In-box Accessories Warranty: 6 months from the date of purchase.
Please retain your proof of purchase for warranty claims. The warranty covers manufacturing defects but typically excludes damage caused by misuse, accidents, or unauthorized repairs.
10. Support
For further assistance, technical support, or service inquiries, please contact vivo customer support through their official channels. You can usually find contact information on the vivo official website or within the device's settings under 'About phone' or 'Support'.
Manufacturer: vivo Mobile India Pvt Ltd Plot No 08, Sector 24, Yamuna Expressway Area, Gautam Buddha Nagar, Uttar Pradesh, 201310







