I seriously doubt that a Sportsbook would Turn Away Your Business If You Refuse To Give Up Your Phone Number. Temporarily suspending it until they find out why you are provide a fake number is another question.
Actually Scott I've found out that some (Or at least one) will.
Why does someone put a phone phone number anyways? If they don't want calls then all they need to do is tell the company "I don't want calls". What did that take ... 4 seconds?
As with most software, it won't submit if a required field is left empty.
Thus, the reason a random, oddball number was entered.
Then, when the login would not work, and the company was contacted, they told the customer that the account was locked because an invalid phone number was entered.
When the customer explained the reason (didn't want them calling) he did not want to list his number, they told him "Then The Account Will Remain Closed".
So he said fine whatever.
That's poor business and what makes it even worse is that since they knew it was an invalid number that means that they had already attempted to call him ! The exact reason he didn't wan't to include it in the first place...