.static-block {
	display: table;
	width: 100%;
	padding: 2px 0;
}
.static-block label {
	display: table-cell;
	width: 1%;
}
.static-block input {
	display: table-cell;
	width: 100%;
	border: 2px solid #eee;
	background: #f0f0f0;
	font-weight: bold;
	margin-left: 1ex;
}

<div class="col-sm-6">
  <div class="static-block">
    <label>Телефон:</label>
    <input type="text" readonly value="79876543210">
  </div>
</div>

<div class="col-sm-6">
  <div class="static-block">
    <label>Телефон:
      <input type="text" readonly value="79876543210">
    </label>
  </div>
</div>