Why does it tell me there was a issue with network when i try to restore my i phone on I TUNES

If you forgot the passcode on your iPhone, or your iPhone is disabled or unavailable -

How to reset your passcode without a computer if you have iOS 15.2 or higher.

How to remove your iPhone, iPad, or iPod touch passcode without a computer - Apple Support

How to reset your passcode using a computer.

If you forgot your iPhone passcode - Apple Support

What kind of error message are your receiving?

See this link to troubleshoot this problem If you see an error when you update or restore your iPhone, iPad, or iPod - Apple Support