لینک به شماره موبایل

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>contact us</title>
    <style>
        #tel {
            display: block;
            width: 200px;
            height: 50px;
            background-color: #4CAF50;
            color: white;
            text-align: center;
            line-height: 50px;
            text-decoration: none;
            border-radius: 5px;
            font-size: 20px;
            margin: 100px auto;
        }
        #tel:hover {
            background-color: #45a049;
        }
    </style>
</head>
<body>

    <a href="tel:090000000" id="tel" title="contact us">contact us</a>

</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>testing</title>
</head>
<style>
    .but_con{
        align-items: center;
        justify-content: center;
    }
    .but{
        text-align: center;
        align-items: center;
        justify-content: center;
        color: aliceblue;
        font-weight: bolder;
        display: flex;
        border: 2px solid white;
        border-radius: 80%;
        padding: 20px;

    }

     .but:hover{
        background-color: rgb(13, 83, 152);
        transition-duration: 1000ms;
     }
</style>
<body style=" padding: 0; margin: 0;">
    <div style="background-color: black; width: 100%; height: 100vh; display: flex;align-items: center; justify-content: center;">
        <div class="but_con">
            <div class="but">
                <a href="phone=+09900000000"  style="text-decoration: none; color: aliceblue; font-weight: bolder; font-size: 40px;text-align: center; align-items: center; ">click here</a>
            </div>
        </div>
    </div>
</body>
</html>

<!DOCTYPE html>
<html lang='fa' dir='rtl' >
<head>
    <meta charset='utf-8'>
    <meta name='viewport' content='width=device-width, initial-scale=1'>
    <title>لینک به شماره موبایل</title>
</head>
<body>
    <a href="tel:090000000" title="با ما تماس بگیرید">تماس با ما</a>
</body>
</html>

<!DOCTYPE html>
<html>
<head>
    <title>Project</title>
    <link rel="stylesheet" href="project.css" type="text/css">
</head>
<body>
    <a href="tel=+989000000" title="با ما تماس بگیرید">با ما تماس بگیرید.</a>
</body>
</html>

<!--CSS-->
@charset 'utf-8';
*{
    padding: 0px;
    margin: 0xp;
    font-style: italic;
    box-sizing: border-box;
}

a{
    margin: 30px;
    text-decoration: none;
    color: rgb(90, 90, 230);
}

<!DOCTYPE html>
<html lang="fa">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>تماس با ما</title>
    <style>
        a{
            border: 2px solid rgb(68, 68, 68);
            border-radius: 5px;
            color: rgb(212, 105, 105);
            text-decoration: none;
            padding: 10px;
        }
        a:hover{
            color: rgb(93, 93, 238);
        }
    </style>
</head>
<body>
    <a href="tel:090000000" title="با ما تماس بگیرید">تماس با ما</a>
</body>
</html>

<!DOCTYPE html>
<html lang="fa">
<head>
  <meta charset="UTF-8">
  <title>تماس با ما</title>
</head>
<body>
  <a href="tel:090000000" title="با ما تماس بگیرید">تماس با ما</a>
</body>
</html>

<!DOCTYPE html>
<html lang="en" dir="rtl">
<head>
    <style>
        a{
            border: 2px solid black;
            border-radius: 8px;
            color: red;
            text-decoration: none;
            padding: 5px;
        }
        a:hover{
            color: blue;
        }
    </style>

</head>
<body>
    <a href="tel:090000000" title="با ما تماس بگیرید">تماس با ما</a>

</body>
</html>