Most WAP phone displays are so small that it's difficult to fit more than three or four option fields on the screen at the same time. By splitting up the option fields like shown below, it is possible to have as many option fields as memory will allow.

  <select title="longselectlist">
    <optgroup title="option1">
      <option>option1-1</option>
      <option>option1-2</option>
      <option>option1-3</option>
    </optgroup>
    <optgroup title="option2">
      <option>option2-1</option>
      <option>option2-2</option>
      <option>option2-3</option>
    </optgroup>
    <optgroup title="option3">
      <option>option3-1</option>
      <option>option3-2</option>
      <option>option3-3</option>
    </optgroup>
  </select>