Wow. Not only did you not answer the question "can I just block specific number rather than only allowing certain numbers," you posted a link to a 14-page document which states that what the user wants is not possible. The trusted contacts feature is potentially dangerous; for example, my daughter became stranded in an unfamiliar location at nighttime because she and her mother were suddenly unable to exchange texts after switching to this plan. I cannot wait to leave Verizon owing to its awful customer service.