ipsos-components/src/material-examples/input-prefix-suffix/input-prefix-suffix-example.html

Material Design components for Angular

<form class="example-form">

  <mat-form-field class="example-full-width">
    <span matPrefix>+1 &nbsp;</span>
    <input type="tel" matInput placeholder="Telephone">
    <mat-icon matSuffix>mode_edit</mat-icon>
  </mat-form-field>
  
</form>