When purchasing a new landline--also called fixed-line--telephone, the customisable features that come with it will no doubt be set to default positions of some kind. Many times, this means that your ringer volume, call volume, answering machine and more won't be what you would like. Fortunately, by definition, these customisable features can be changed. If you've found that your phone isn't loud enough, there may be a simple solution that could take you only seconds to apply.
Look on the side of your phone's receiver--the device into which you talk and from which you hear--to see if there are small "Up" and "Down" buttons. If there are, press the "Up" button, which is most likely the top one, to increase your ringer's volume. You should hear a sample of the current phone's ring setting after pressing the button.
Press "Up" or "Down" on the main button located near the phone's screen. Many times this is a small, circular button that might have a tiny picture of a book on one side, a symbol that says "ID" on the other side, and up and down arrows located at the top and bottom of the button. It should be the only button that has these kinds of symbols on it. Many newer phones use a button like this to increase or decrease ringer volume, as opposed to the option in the previous step. Press the "Up" part of the circle to increase the phone's ringer volume.
Press the "Talk" or "Call" button on your phone and wait for a second until you hear the dial tone coming from the receiver. Pressing "Up" (using either of the previous steps, according to your phone type) will now increase the volume of your voice and the voice of the person on the other end of the line. Making your phone louder in this way will allow you to more clearly communicate over the phone with friends and family.