Free accounts can't send messages and can't read messages.
Outside contact information on a profile isn't allowed on SLS, any profiles containing that information should should not have been approved. As Melvin said, profiles you encounter with outside contact information should be reported using the button you see on the profile.
That said, it's pretty foolish to attempt to use an outside contact method unless you have messaged with the profile owner(s), feel comfortable with them and the info was provided in a private message, which Free Members can't do.
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