Q: Windows,PC,B2B,iTunes1.24..31,connectivity,problem

Hello there, Saurabh3002!

Thanks for reaching out to the Apple Support Communities! It sounds like you are having an issue getting iTunes to recognize your iPhone. I know how important it is to be sure iTunes is able to sync to your device. Check out this article that talks about If iTunes doesn‘t recognize your iPhone, iPad, or iPod. These steps will help you with issues you're experiencing with iTunes. Specifically:

When iTunes on your computer doesn't recognize your connected device, follow these steps. Try again after each step:

1. Make sure that you have the latest version of iTunes that works with your computer.
2. Check that you have the latest software on your Mac or Windows PC.
3. Make sure that your device is turned on.
4. If you see a Trust this Computer alert, unlock your device and tap Trust. If you still see the alert, you might need to reset your lockdown folder.
5. Unplug all USB accessories from your computer except for your device. Try each USB port to see if one works. Then try a different Apple USB cable.
6. Restart your computer and iPhone, iPad, or iPod.
7. To see if your device needs service, try another computer. If you have the same issue again, contact Apple Support.

Just be sure when you try the steps for Windows PCs, you use the ones for the version of Windows you are surrently running.

Also, you can check out this article with steps for If iTunes doesn‘t respond when you connect an iOS device

Cheers!