Connect to existing WiFi network with NO ethernet connection in apartment

Live in retirement community with building wide WiFi.  NO ethernet connections in apartment.  How do I connect this router to the existing WiFi network?  Need to use router because need Hearing Impaired Caption Call telephone.  This phone can not connect to existing WiFi via current 3rd party Internet Page.  I was told I needed a router to connect to existing WiFi and then the phone can connect via the Netgear router.