gistfile1.php

function beforeSave(){
		$d = &$this->data[$this->alias];
		
		if ( !$this->id && !isset($d['id']) ) {
			//check if we already have that phone register (would be an update)
			$id = $this->field('id', array('phone' => $d['phone']));
			$this->id = $d['id'] = $id;
		}

		if(isset($d['phone']))
			$d['phone'] = $this->escapePhone($d['phone']);

		return true;
	}