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Your apartment is wired for two lines but you are using only one of the two. Your phone jack has red and green terminals for one line and yellow and black terminals for the other (old color codes). The four wires coming in to your apartment are actually two lines: orange/white and white/orange plus blue/white and white/blue (new color codes). One of those lines is active. Connect the orange/white wire to the red terminal and the white/orange wire to the green terminal. Plug in your phone and listen for a dial tone. If no tone, disconnect the first line and connect the second pair of wires. Listen again. DO NOT CONNECT ANY WIRES TOGETHER. Just follow the steps above. If you still don't get results, the phone company may not have activated your connection
Most cheap jacks have 4 wires, red, green, yellow & black. Most modern houses have wires paired up (twisted pair) like blue & white with blue line or stripe. Line 1 is red/green or blue/white. Line 2 is yellow/black or orange/white(with orange line/stripe).
If your hooking up the telephone jack for one line you would connect your line to the red/ green pair (3 and 4). If your hooking up 2 lines your second line would go on the yellow/ black pair (2 and 5). If you were hooking up a third line to the jack it would go on the white/ blue pair (1 and 6).
Pity that whoever did your remodel didn't give you a floor plan. In new construction, we make everything go to a central point. Old style was to loop everything through. It would be easy to tell, because you'd see the loops.
If you want to do this yourself, and save some money, give this a try.
The color code is that the green/red/black/yellow go to the jack. Hook all 4 wires (8 because you're going to hook both cables together to a jack) to the jack. Then, down the road, when someone has to add a second line they won't have to open this back up again. When it comes to the paired cable, look at the wires. One of the wires has more white than blue (White/Blue lead) and one has more Blue that white (blue/white lead) and so forth. You're going to be working with the blue pairs and the orange pairs, and spare out the green and brown pairs.
Strip the 4 remaining wires (the ends so they can go on the screw terminals) and connect them as follows:
White/Blue to Green Blue/White to Red White/Orange to Black Orange/White to Yellow.
If you're using Insulation displacement jack (the kind with caps where you push the wires into the slots), STOP! You're going to need more parts.