You will get better feedback if you unscrew the faceplate and post a picture of the back of the newly installed jack, a copy of any text you can read on the cable and whatever is at the other end of the cable.
You can plug a phone cord (rj11 or rj12) into an ethernet jack. Over time, you can bend the pins in the ethernet jack doing this, but fixing this is easy.
You will get better feedback if you unscrew the faceplate and post a picture of the back of the newly installed jack, a copy of any text you can read on the cable and whatever is at the other end of the cable.
You can plug a phone cord (rj11 or rj12) into an ethernet jack. Over time, you can bend the pins in the ethernet jack doing this, but fixing this is easy.