See if phones lines are working fine
Find out whether the extra phone lines in your home are operational. If they are not working, then call your phone company and tell them the issue you are facing. Check if all the phone receivers in your home are placed properly. Make sure all phone lines are plugged into the phone jack. However, if you encounter an issue with only one phone, put in another phone into the jack. If this phone is working fine, then know that your first phone is faulty and you need to replace it.
Call on your phone line
Place a call on your home number from a cell phone to see if it rings and if it does, then see what happens. You may the phone line ringing or it might go to your voice mail provided that you have subscribed the particular service. You can also get a busy signal or hear a voice saying that the phone is out of service or the service has been disabled. Call your phone operator if the situation occurs in the last two cases.
Unplug every phone and answering machine in your home one by one. Wait around half a minute after unplugging the phone device. Get another phone to check if you get a dial tone in it. If such is the case, then your phone is faulty. In the other case, unplug phones again and see if you hear a dial tone. If you come across a phone that still does not work, plug all your phones and check then. The phones that do not work need to be replaced as soon as possible.