symfony - textbox is not displayed when I use integer as field type in symfony2 -

i using integer type field in form type of symfony2. code follows:

$builder->add('phonenumber', 'integer',array(                 'required'      => true,                 'constraints' => array(                      'pattern' => '/^[0-9]\d*$/',                       new length(array(                          'min'   => 10,                          'max'   => 20                                ))          )));  

although phone number field validated, uparrow , downarrow displayed , if click on getting numbers -1 instead of textbox. if put number field type textbox dispayed field not validated. grateful if me out issue. in advance.

integer fields aren't used (only literal integers, , not always). phone number you'd want text field.

update

use symfony\component\validator\constraints\regex; use symfony\component\validator\constraints\length;  $builder->add('phonenumber', 'text', array(     'required' => true,     'constraints' => array(         new regex(array(             'pattern' => '/^[0-9]*$/'         )) ,         new length(array(             'min' => 10,             'max' => 20         ))     ) )); 

@rufinus's answer may better option.