The best way to go about it is get a Turkish friend to go with you to the Turktelekom office to help you complete the paperwork. It helps if you know the telephone number of your nearest neighbour and their surname. I don't know whether this applies in Calis, but in the villages apparently this makes it easier for Turktelekom to establish exactly where your property is. Line rental is very cheap. I've heard though, that there are parts of Fethiye where there are not any new lines available.