Introduction
This manual provides instructions for the LG G4 H812 smartphone. It covers essential information regarding device setup, operation, maintenance, and troubleshooting to ensure optimal performance and user experience. Please read this manual thoroughly before using your device.
1. Setup
1.1 Unboxing and Package Contents
Carefully unpack your LG G4 H812 and verify that all components are present. The standard package typically includes the smartphone, battery, charger, USB cable, and a quick start guide.

Image 1.1: LG G4 H812 smartphone in its packaging, displaying the rear of the device.

Image 1.2: LG G4 H812 smartphone with included charger and USB cable within the box.
1.2 Battery Installation
- Locate the notch on the bottom edge of the phone.
- Gently pry open the back cover using the notch.
- Align the battery contacts with the terminals inside the battery compartment.
- Press the battery down until it clicks into place.
- Replace the back cover, ensuring all edges are securely fastened.
1.3 SIM Card and MicroSD Card Installation
- Remove the back cover and battery as described in Section 1.2.
- Locate the SIM card slot and, if applicable, the MicroSD card slot.
- Insert the SIM card with the gold contacts facing down, sliding it into the slot until it locks.
- If using a MicroSD card, insert it into its designated slot with the gold contacts facing down.
- Reinstall the battery and back cover.
1.4 Initial Power On and Setup Wizard
- Press and hold the Power/Lock key (located on the back of the device) until the LG logo appears.
- Follow the on-screen instructions to complete the initial setup, including language selection, Wi-Fi connection, Google account setup, and security settings.
2. Operating Instructions
2.1 Basic Navigation
- Touchscreen: Tap to select, swipe to scroll, pinch to zoom.
- Home Key: Returns to the home screen.
- Back Key: Returns to the previous screen.
- Recent Apps Key: Displays recently used applications.
- Power/Lock Key: Turns the screen on/off, locks/unlocks the device, or powers off the device when held.
- Volume Keys: Adjusts media and call volume.
2.2 Making Calls
- Tap the Phone icon on the home screen.
- Enter the phone number using the dial pad or select a contact.
- Tap the Call icon to initiate the call.
2.3 Sending Messages
- Tap the Messages icon.
- Tap the New Message icon.
- Enter the recipient's phone number or select from contacts.
- Type your message and tap Send.
2.4 Connecting to Wi-Fi
- Go to Settings > Wi-Fi.
- Toggle Wi-Fi On.
- Select your desired network from the list.
- Enter the password if prompted and tap Connect.
2.5 Camera Operation
- Tap the Camera icon.
- Frame your shot.
- Tap the Shutter button to take a photo.
- To record video, switch to video mode and tap the Record button.
3. Maintenance
3.1 Cleaning the Device
- Use a soft, lint-free cloth to clean the screen and body.
- Avoid using harsh chemicals or abrasive materials.
- For stubborn smudges, slightly dampen the cloth with water.
3.2 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 > About phone > Software updates.
3.3 Battery Care
- Avoid extreme temperatures, which can degrade battery life.
- Use only LG-approved chargers and cables.
- For optimal battery longevity, avoid frequently discharging the battery completely or keeping it at 100% charge for extended periods.
3.4 Storage Management
To maintain device performance, regularly manage your storage. Delete unnecessary files, uninstall unused apps, and move large media files to cloud storage or a MicroSD card.
4. Troubleshooting
4.1 Common Issues and Solutions
| Issue | Solution |
|---|---|
| Device not turning on | Ensure the battery is charged. Connect the charger and wait a few minutes before attempting to power on. If the battery is removable, ensure it is correctly installed. |
| Poor network signal or no service | Check if your SIM card is properly inserted. Restart the device. Verify your network settings and ensure you are in an area with network coverage. |
| Applications crashing or freezing | Close and restart the application. Clear the app's cache and data via Settings > Apps. Ensure the app is updated to the latest version. |
| Battery drains quickly | Reduce screen brightness, disable unused features like Wi-Fi or Bluetooth, and close background apps. Check battery usage in Settings > Battery to identify power-consuming apps. |
4.2 Factory Data Reset
A factory data reset will erase all data from your device and restore it to its original factory settings. This can resolve persistent software issues. Backup all important data before proceeding.
- Go to Settings > Backup & reset.
- Tap Factory data reset.
- Tap Reset phone and then Erase everything to confirm.
5. Specifications
| Feature | Detail |
|---|---|
| Brand | LG |
| Model Name | G4 H812 |
| Item Model Number | H812 |
| Operating System | Android 6.0 Marshmallow |
| Display Technology | LCD |
| Screen Size | 5.5 Inches |
| Resolution | 2560 x 1440 (1440p) |
| Processor Type | Snapdragon |
| RAM Memory Installed Size | 3 GB |
| Digital Storage Capacity | 32 GB |
| Optical Sensor Resolution | 16 MP |
| Battery Power Rating | 3000 Milliamp Hours (Lithium Ion) |
| Cellular Technology | LTE |
| Connectivity Technology | Bluetooth, Wi-Fi |
| Form Factor | Slate |
6. Warranty and Support
For detailed warranty information, please refer to the warranty card included with your product or visit the official LG website. LG provides customer support for product inquiries, technical assistance, and service requests.
Official LG Support: https://www.lg.com/ca_en/support