function copyPhoneList() {
  var hasFirstName = false;
  var ss = SpreadsheetApp.getActiveSpreadsheet();

  var data = ss.getRangeByName("masterPhoneListData").getValues();
  var range = ss.getRangeByName("masterPhoneListData");
  var numColumns = range.getLastColumn() - range.getColumn() + 1;
  var phoneList = new Array();

  for (i=0; i<data.length; i++) {
    hasFirstName = !isCellEmpty(data[i][4]);
    if (hasFirstName) {
      var record = new Array();
      for (j=0; j<numColumns; j++) {
        switch(j) {
          case 0: // DID (Direct Inward Dial)
          case 1: // Ext
          case 2: // Office
          case 3: // First Name
          case 4: // Last Name
          case 6: // Cell Phone
            record.push(data[i][j]);
            break;

          default:
            break;
        }
      }
      phoneList.push(record);
    }
  }

  // now push it all over to the target sheet
  var target = ss.getSheetByName("Read Only");
  target.clearContents(); // empty out our target sheet, preserving the formatting
  var heading = ['Direct', 'Ext', 'Office', 'First Name', 'Last Name', 'Cell Phone'];
  //target.appendRow(heading); // put the first heading row into our target sheet

  var headersRange = target.getRange(1, 1, 1, heading.length);
  headersRange.setValues([heading]);

  phoneList.sort(function(a, b) {
    if(a[3].toLowerCase() === b[3].toLowerCase()) {
      var x = a[4].toLowerCase(), y = b[4].toLowerCase();
      return x < y ? -1 : x > y ? 1 : 0;
    } else {
      var x = a[3].toLowerCase(), y = b[3].toLowerCase();
      return x < y ? -1 : x > y ? 1 : 0;
    }
  });

  // All done, put the data into place
  target.getRange(2, 1, phoneList.length, phoneList[0].length).setValues(phoneList);
}