New Cox service and phone jacks not working

My Cox service was just installed a couple weeks ago.  I previously had ATT Uverse which then went to Frontier.  I just realized that none of the phone jacks in my house are working except the one in the kitchen.  Why would that be?  In the kitchen I have a base set with an extension in my family room that doesn't need a jack.  That has worked fine since the service was installed.  I have a wired connection in my bedroom that doesn't work and I tried moving the phone from my kitchen to another phone jack, and that one is not working either.  Looks like only the one jack in the kitchen is working.  Do I need to get the technician back here or is this something I can fix myself?

Mickey