While you won’t be able to convince a fiber provider to come to new territory in a new city, if you live just outside an ISP's coverage area, you may be able to persuade it to connect you. They’ll likely charge you for the connection—anything between hundreds and thousands of dollars, depending on how far the new line will have to run and how badly they want your business. A new connection is probably only viable, for both you and them, if you live just on the edges of their service area— for instance if your neighbors across the street are connected to fiber and you aren't.