CodePen Embed - MWYwbBL

<head>
 <link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.11.2/css/all.css">
</head>
<i class="fas fa-phone fa-4x">

i{
  -webkit-animation:tel-animation 0.2s infinite linear alternate;
      animation:tel-animation 0.2s infinite linear alternate;
}
@-webkit-keyframes tel-animation {
    0% {-webkit-transform:translate(0, 0) rotate(-3deg);}
    50% {-webkit-transform:translate(0, -1px) rotate(0deg);}
    100% {-webkit-transform:translate(0, 0)rotate(3deg);}
  }

@keyframes tel-animation {
    0% {transform:translate(0, 0) rotate(-3deg);}
    50% {transform:translate(0, -1px) rotate(0deg);}
    100% {transform:translate(0, 0)rotate(3deg);}
  }

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