TeleSign Number Masking is a free service, using cloud communications APIs, that enable the ability for two parties to communicate with each other for a short period of time over Voice and SMS without exposing their actual phone numbers. This enables the two parties to accomplish the task at hand without unnecessarily exposing any private information. This is very use full when you are working with a company that doesn't want to give their phone numbers. This is a very use full service when you are working with a company that doesn't want to give their phone numbers. It allows you to mask the phone number so that the other party doesn't know who the caller is. It is very easy to use and it is very reliable. I have heard that occasionally it does not mask the number, but that is very rare. I would recommend it to anybody that needs to mask their phone number. I have been using it for business purposes and it has been very successful. I have not found anything that I dislike about it.