How to fix a SIM error on an LG E400?
- AAlexander BallSep 2, 2025
If your LG Cell Phone displays a SIM error, it means that either there is no SIM card in the phone or it is inserted incorrectly. Make sure that the SIM card is correctly inserted.

How to fix a SIM error on an LG E400?
If your LG Cell Phone displays a SIM error, it means that either there is no SIM card in the phone or it is inserted incorrectly. Make sure that the SIM card is correctly inserted.
Why does my LG Cell Phone hang up or freeze?
If your LG Cell Phone hangs up or freezes, it could be due to an intermittent software problem. To resolve this, remove the battery, insert it again, and switch on the phone. You can also try to perform a software update via the website.
Why doesn't my LG Cell Phone screen turn on when I receive a call?
If the screen on your LG Cell Phone doesn't turn on when you receive a call, it could be a proximity sensor issue. If you're using a case or screen protector, make sure it's not covering the area around the proximity sensor. Ensure the sensor area is clean.
How to fix an LG E400 that keeps hanging up or freezing?
If your LG Cell Phone hangs up or freezes, it might be due to an intermittent software problem. Remove the battery, reinsert it, and switch the phone on. Try performing a software update via the website.
How to fix a SIM error on my LG E400 Cell Phone?
If your LG Cell Phone displays a SIM error, it might be due to the SIM card not being inserted correctly or not being present. Ensure that the SIM card is correctly inserted.
How to fix an LG Cell Phone that cannot be switched on?
If your LG Cell Phone won't switch on, press and hold the On/Off key for at least two seconds. Ensure the battery is charged and check the charging indicator on the display. Clean the battery contacts if they are dirty.
What to do if the screen does not turn on when I receive a call on my LG E400?
If your LG Cell Phone screen doesn't turn on when you receive a call, and you're using a protective tape or case, check if it's covering the area around the proximity sensor. Ensure the area around the proximity sensor is clean.
How to fix LG E400 Cell Phone when it hang up or freeze?
If your LG Cell Phone is frozen, remove the battery, reinsert it, and switch the phone back on. Additionally, attempt a software update through the website.
What to do if LG E400 Cell Phone is locked and does not function?
If your LG Cell Phone is locked and not functioning, try the following steps: 1. Turn the phone off. 2. Remove the back cover. 3. Remove the battery and reinstall it. 4. Close the back cover. 5. Turn the phone on again.
Why does my LG Cell Phone keep losing network connection?
If your LG Cell Phone loses network connection or has a weak signal, try moving to an open area or near a window. Check the network operator's coverage map to ensure you are within their service area. Also, consider that SIM cards older than 6-12 months may need replacing; visit your network provider to change your SIM.
| Panel type | TFT |
|---|---|
| Display diagonal | 3.2 \ |
| Touchscreen type | Capacitive |
| Display resolution | 240 x 320 pixels |
| Display number of colors | 262144 colors |
| Orientation sensor | - |
| Processor frequency | 0.8 GHz |
| RAM capacity | 0.375 GB |
| Maximum memory card size | 32 GB |
| Internal storage capacity | 1 GB |
| Auto focus | No |
| Rear camera type | Single camera |
| Video recording modes | 480p |
| Rear camera resolution | 2048 x 1536 pixels |
| Video capture resolution (max) | 640 x 480 pixels |
| Rear camera resolution (numeric) | 3 MP |
| 2G standards | EDGE, GPRS, GSM |
| 3G standards | HSDPA |
| Data network | 3G |
| Bluetooth version | 3.0+HS |
| 3G bands supported | 900, 2100 MHz |
| SIM card capability | Single SIM |
| 2G bands (primary SIM) | 850, 900, 1800, 1900 MHz |
| Audio formats supported | AAC, AMR, eAAC+, MIDI, MP3, WAV, WMA |
| Video formats supported | 3GP, H.263, H.264, MP4, MPEG4, WMV |
| HDMI ports quantity | 0 |
| Headphone connectivity | 3.5 mm |
| USB 2.0 ports quantity | 1 |
| Form factor | Bar |
| Product color | White |
| Personalization | Widgets |
| Personal info management (PIM) | Alarm clock, Calculator, Calendar |
| Text prediction system type | T9 |
| Multimedia Messaging Service (MMS) | Multimedia Messaging Service (MMS) is a standard way to send messages that include multimedia content to and from a mobile phone over a cellular network |
| Platform | Android |
| App distribution platform | Google Play |
| Operating system installed | Android 2.3 |
| Battery capacity | 1500 mAh |
| Depth | 11.7 mm |
|---|---|
| Width | 61.3 mm |
| Height | 102.6 mm |
| Weight | 103 g |
Information about radio wave exposure and Specific Absorption Rate (SAR).
Proper handling and care instructions for the phone and its accessories.
Guidelines for safe mobile phone use while driving.
Precautions to prevent hearing damage from loud sound exposure.
Guidelines for using the phone on an aircraft.
Information about making emergency calls and network dependency.
Guidelines for battery charging, usage, and maintenance.
Proper disposal of electrical and electronic products.
Proper disposal of used batteries and accumulators.
Managing phone memory and deleting data to free up space.
Steps to uninstall applications from the phone.
Tips to extend battery life by optimizing usage and turning off unused features.
How to check the current battery status and level on the phone.
View applications consuming battery power to identify usage.
Warning about installing non-manufacturer OS and potential risks.
Setting up a screen unlock pattern for phone security.
Steps to perform a full factory reset on the phone.
How to connect to available Wi-Fi networks.
Steps to enable Wi-Fi and connect to a network.
How to open and switch between multiple running applications.
Steps to stop running applications.
Download and installation steps for LG PC Suite from the LG website.
Minimum system requirements for installing LG PC Suite on a computer.
Steps to transfer media files between phone and PC using USB.
How to use volume keys for call and media volume.
Location of the stereo earphone connector.
Function of the power and lock key.
Steps to connect the charger and plug it into an electrical outlet.
Steps to format the memory card for use.
Tips for navigating the phone's touchscreen interface.
How to lock the phone to prevent accidental presses and save battery.
How to unlock the phone screen using a pattern.
How to switch to silent mode via the notification panel.
How to create a custom unlock pattern for phone security.
How to add shortcuts and widgets to the home screen for easier access.
How to access a list of recently used applications.
Location and function of the notification drawer.
Tips for typing, capitalization, and entering special characters.
How to type accented characters in different languages.
How to enable Wi-Fi on the phone.
How to connect to available Wi-Fi networks.
How to share the phone's data connection via USB or Wi-Fi hotspot.
How to configure USB tethering and portable Wi-Fi hotspot.
Steps to share phone data connection using USB.
How to connect via USB and share data.
How to set up the phone as a portable Wi-Fi hotspot.
How to change the Wi-Fi hotspot name and secure it.
Steps to make a phone call using the keypad.
How to call contacts from the address book.
How to answer or reject an incoming call.
How to adjust call volume using the side keys.
How to make a second call while on an active call.
How to view a list of all dialled, received, and missed calls.
How to configure call settings like call forwarding and barring.
How to search for contacts by name.
Steps to add a new contact, including photo and contact type.
How to classify frequently called contacts as favorites.
Steps to add a contact to the favorites list.
Steps to remove a contact from the favorites list.
How to export and import contacts using PC sync software.
Overview of SMS and MMS messaging features.
Steps to compose and send an SMS message.
How messages are organized chronologically for conversation overview.
How to use smiley icons in messages.
How to customize message settings.
How to open the email application and manage accounts.
Steps to add and manage email accounts using the setup wizard.
Overview of the accounts screen, showing combined inbox and individual accounts.
How to view all messages from multiple accounts in a combined inbox.
Step-by-step guide to composing and sending an email message.
Understanding the different folders (Inbox, Outbox, Sent, Drafts) for each email account.
Steps to add, edit, or delete email accounts.
How to modify existing email account settings.
How to remove an email account from the phone.
Overview of camera controls and viewfinder elements.
Simple steps to take a photo quickly.
Options available after taking a photo, like sharing or renaming.
Accessing and adjusting advanced camera settings.
How to access and view saved photos within the camera mode.
Overview of the video camera viewfinder and its controls.
Steps to quickly record a video.
Options available after recording a video, such as playback or sharing.
Adjusting advanced video camera settings.
How to watch saved videos from the gallery.
How to adjust video playback volume using the phone's volume keys.
List of preloaded useful applications on the phone.
How to open the gallery and view multimedia files.
Different viewing modes for photos and videos in the gallery.
How the gallery displays photos and videos chronologically.
Using the built-in music player to play songs.
Steps to select and play music tracks.
How to transfer files between phone and PC using USB.
Steps to transfer music and video files from PC to phone.
How to send data from phone to other devices via Bluetooth.
Steps to set and configure alarms.
How to use the phone's calculator for basic and complex calculations.
How to add, edit, and manage calendar events.
How to change the calendar view to day, week, or month.
Use the voice recorder to record voice memos or other audio files.
Steps to start, stop, and listen to voice recordings.
How to send recorded voice clips via Bluetooth, Gmail, or Email.
Overview of Polaris Office for viewing office documents on mobile devices.
Features for managing files like copying, renaming, and deleting.
How to view various file types, including Microsoft Office and Adobe PDF documents.
How to manage installed applications, check running services, and uninstall apps.
Using the browser for internet access, games, news, and entertainment.
How to use the web browser toolbar for navigation and managing windows.
Accessing and using browser options like read later, RSS feeds, and sharing.
Managing Wi-Fi, Bluetooth, mobile networks, and airplane mode.
Configuring call settings like call forwarding and barring.
Adjusting phone sound settings, including ringtones, media, and alarms.
Adjusting screen brightness, auto-rotate, animation, and timeout.
Settings for wireless networks, GPS, and screen lock.
Setting language, region, and keyboard preferences.
Configuring voice input and text-to-speech settings.
Configuring accessibility plug-ins for the phone.
Managing Wi-Fi, Bluetooth, and connection modes.
Setting preferred date and time formats, and time zone.
Viewing legal information, phone status, and software version.
Checking internal and SD card storage space.
Setting local language and region as well as keyboard settings.
Configuring voice input and text-to-speech settings.
Managing Google and other account synchronization settings.
Changing settings for managing phone data and privacy.
Updating phone software via the Internet.
Downloading the latest firmware from the internet.
Updating phone firmware wirelessly via OTA.
Information about DivX video format and DivX Certified devices.
Information on learning more about the LG-E400.
Operating and charging temperature ranges for the device.
Troubleshooting SIM card errors.
Troubleshooting no network connection or signal loss.
Troubleshooting issues with security code mismatches.
Troubleshooting issues with setting applications.
Troubleshooting issues with making or receiving calls.
Troubleshooting steps for when the phone cannot be powered on.
Troubleshooting charging issues and related errors.
Troubleshooting issues with restricted numbers.
Troubleshooting problems with sending or receiving SMS and pictures.
Troubleshooting issues with opening files.
Troubleshooting SD card compatibility and formatting issues.
Troubleshooting screen not activating during incoming calls.
Troubleshooting audio issues and checking sound settings.
Troubleshooting phone freezing or hanging up.
Troubleshooting steps for a locked or non-functional phone.