Using fake contact info is fine for opening a demo account. For a live account, it's a really bad idea.
If you ever want to withdraw your money, your proof of residence will need to point to the address you claimed to be at.
If the broker is looking for the slightest excuse to cancel your profits, showing that you deliberately filed false information may be all they need.
Here's a simple rule to live by. If you don't trust your broker with your home address, then don't trust them with even 1 cent of your money.