You should never put your phone number in an online profile!! Google, YouTube, Facebook, LinkedIn, etc, etc.. just because your profile is private, except maybe for your friends, doesn't mean the site won't harvest it and sell it.. they do..
READ THE SITES DISCLAIMERS! Most will not do this if you tell them not to, by changing your privacy settings. But you have to initiate this because their default privacy settings spell it out plain and simple.. they have right to sell your personal data to their 3rd party partners. Some go as far as telling you they are going to access your personal address book and send emails or make phone calls to the people you have listed in there.. This is like using a changing room at a department store with a sign on the door that reads "we are going to watch you undress and may video tape you". Don't believe me... read the privacy terms on any Android or iPhone app that accesses Facebook, Twitter, Yahoo, Google+, MSN or any social and/or gaming site.. they all say this one way or another.. they are going to rape you, but they are kind enough to let you know in advance.. it hurts at first and you feel violated, but then you get used to it.. sad but true.. Bah, Sheep, Bah...