I need to remove the telephone as required in Magento for this I have followed some tutorial and make some changes first I just copy the abstract.php to local folder and comment the line
if (!Zend_Validate::is($this->getTelephone(), 'NotEmpty')) {
$errors[] = $helper->__('Please enter the telephone number.');
}
after that i have removed all the validation class from billing.php and shipping .php and then in database eav_attribute
table make required option to 0 and removed the validation rule from customer_eav _attribute
table but after doing all these things i'm getting an alert box by saying
Telephone is required value telephone length must be greater than 1 character