Can I sue someone for giving out my phone number without permission to a third party?
No, there is no lawsuit for giving out a phone number UNLESS you actually had some agreement with that person (like a nondisclosure or confidentiality agreement) that they would keep your phone number confidential. If you did have such an agreement, it is possible that you might be able to sue for breach of contract--though even then, unless you have suffered some tangible injury (e.g. the number was given out to a stalker or harasser of yours, who then used it to stalk/harass you; the phone number was somehow used to steal your identify and run up charges in your name; etc.), there is nothing to sue for. That is, the law, does not allow people to recover compensation just because someone else did something wrong; instead, the law compensates for injury. So no injury--and just be annoyed or upset or having to talk to people you'd rather not talk to is *not* an injury in the eyes of the law--nothing to sue for.