We know how important it is to have your services working properly! Lets get this fixed. Is your services with Verizon Fios/Landline or Verizon Wireless?
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Have you ever successfully connected anything to your wifi router? Is your network name being broadcast by the router? Is your network name showing up on their devices as available wifi signals? What happens when they click on your network name in the available signals on their device(s)? Are they typing in the correct password, keeping in mind the password IS case sensitive.
Not much help we can give with the limited amount of information you have provided.