How to Fix AT&T Care Code 201 [LU100]: A Detailed Guide

It can be frustrating if you’re an AT&T subscriber and receive Care Code 201 [LU100]. This error code typically indicates an issue with your service or equipment. Nevertheless, by following a few simple troubleshooting steps and being patient, you can resolve the problem and restore your AT&T services.

Firstly, you need to check if another device in your home or office might be causing interference with your services, such as cordless phones, Wi-Fi routers, microwaves, etc.… These devices can disrupt service even if they are not on. In this comprehensive tutorial, I will guide you through the steps to resolve AT&T Care Code 201 [LU100].

Here are some steps to fix the AT&T Care Code 201 [LU100]

1. Confirm the error:

Before you make any changes to your account, it is advisable to confirm the reason for the error. AT&T usually sends a text message with a link to the relevant page, which will contain information regarding your error. Follow the link and check AT&T’s detailed description of what could be causing the problem. Instructions will accompany the report on fixing it and returning it online. 

2. Check for service Outages: 

If your Internet services are still down, it is time to check for service outages with your provider. You can contact AT&T’s customer support via phone or email for further assistance.

3. Check the following settings:

AT&T subscribers need to check the settings on their devices to see if there are any errors related to text messaging and data usage while using their services. Some common settings that need checking are texting restrictions and data roaming grounds on integrated mobile devices such as smartphones and tablets. If these settings are not properly configured, connectivity issues will occur. 

4. AT&T Subscribers should check for software updates: 

If you have subscribed to AT&T’s services over the Internet, you should check for software updates. This is a software update that improves your device’s performance. Updates are available for almost all devices and operating systems, including mobile phones and computers.

5. Try using the PC Suite:

If you have already installed the PC Suite on your computer, the problem may lie with your computer rather than your AT&T account. You can use the PC suite to monitor and troubleshoot potential issues before they occur. The PC Suite can be downloaded from AT&T’s website

6. Restart your Device: 

Before you begin troubleshooting the error, it’s a good idea to restart your device. This will refresh your device and clear any temporary software issues causing the problem. 

7. Service port reset:

If your computer isn’t working and you plan on taking it in for servicing, you can try restoring the service ports used by your computer. You can also resolve this issue by resetting all of the services on your computer back to their default configurations, usually done through Device Manager on Windows computers or the Services tab on Apple computers. 

8. Check if there is a problem with the router: 

Check for a problem with your local area network or LAN if you still have phone lines. This might be caused by an interfering device, such as a wireless router or microwave near your phone line, causing network congestion. 

9. Check for the latest firmware update: 

Check for a problem with your local area network or LAN if you still have phone lines. This might be caused by an interfering device, such as a wireless router or microwave near your phone line, causing network congestion. 

10. Use a different Microphone: 

This can be done by plugging one end of an audio cable into the microphone jack on your AT&T equipment and the other end into either the built-in microphone jack on your computer’s sound card or into an available microphone input on an external good card that can also be linked to your computer via USB.

11. Make sure your device settings are configured properly: 

If you use a headset with an integrated microphone and receive the AT&T Care Code 201 [LU100], try using another headset since the headset might be damaged or not configured properly. 

12. Check your Device Connection Settings: 

You should ensure that your audio and video Connection Settings are configured properly. This can be done by clicking the Settings button on your device and then the Audio & Video tab. Ensure that the connection is enabled and that you have selected the correct type of connection for your audio devices.

13. Check to see if another device in your household or office is causing interference: 

To troubleshoot this issue, it is always best to check for interference from other devices in your home or office, which could be causing an interference effect with your services, such as cordless phones or Wi-Fi routers. For example, if you receive an error on a computer in a specific location within your home, try configuring your device to use a different wireless network if available.

14. Check for a Telephone Line Delivery Issue: 

Another thing you can look into is a telephone line delivery issue. If any other devices are hooked up to the same phone lines as the phone you are using, they might be causing an interference effect with your services. For example, if you use a computer in another part of your house or office, try re-configuring your device to use a different wireless network if available. You can also contact AT&T’s customer service department via telephone or email for assistance on such issues. 


If all of the troubleshooting measures included in this guide have failed to fix your problems, then you must contact AT&T’s technical support. We recommend that you begin with the steps mentioned above. If all of those steps fail, you should contact AT&T customer support and explain the nature of your issue. At this stage, selecting one of the Ticket options from AT&T’s Support Center is best to resolve your problem quickly.