There are multiple reasons why you may need to cover your tacks on the web. You may do this to help fix your Internet connection, though the majority will not even know this is what is happening when you call your supplier for help. There are occasions when you want to do this, but if you do some thing illegal, this will not protect you like you believe it will. Your old IP will continue to be identifiable, as being you, and this will not get you out of difficulty. I don’t know how to do that though , as I’ve only done it a couple of times and it’s usually been by direction of somebody helping me over the telephone.
Your service supplier will still know what your old one is if something comes up from the time you had it. However, if you are making trouble, they can easily ban you again with your new number, and you’ll have to do it all over again. I am not even sure why this works, or how it works. Maybe it resets your Net connection, though I cannot tell you for sure. If you do not know the way to do it, you can call your service supplier and describe your problem.