Error 633: The Modem is Already in Use or not Configured Properly

"Error 633: The modem(or other connecting devices) is already in use or not configured properly" is a possible error message you may receive while trying to access the Internet mostly using a dial-up connection. If the modem driver installed on your computer is outdated or not compatible with the OS, you may receive this error message. This tutorial explains the reasons and solution to solve this problem. To fix this error, I suggest you try the steps provided below.

The solution for Error 633: The modem is already in use or not configured properly

Troubleshooting steps to solve Error 633: The modem(or another connecting device) is already in use or not configured properly are:

1. Uninstall and Reinstall Modem Driver: To do this follow the steps mentioned in the link below.
   How to Uninstall and Update Modem Driver installed on Your Computer
   
   
2. Delete all saved dial-up connections and create a new one
   
   
3. Change COM Port Assigned for Modem: To perform this step to resolve Error 633: The modem(or another connecting device) is already in use or not configured properly follow the steps mentioned in the link below.
   How to Change COM Port Number Assigned to a Modem
   

Just like the Error 633 related to the Dial-up connection on your computer if you are continuously receiving connection prompt, follow the steps mentioned in the link below.
Continues Dial-up Connection Prompt to Connect to a Network

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"Error 633: The modem(or other connecting devices) is already in use or not configured properly" can be resolved by the steps mentioned in this article.

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Here I give a common troubleshooting guide when you are facing issues with accessing the Internet without having any special error message.
I cannot Go Online due to Internet Connectivity Issues

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The message, Error 633: The modem (or other connecting device) is already in use or not configured properly, displayed mostly on computers with default dial-up modem.

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As I explained, the major reason for this message is the multiple Internet connections setup.

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3. TTL Expired in Transit
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Another important reason is the allocation of the communication port for another software installed on the PC.