How to change sms verification content

We have filters for it.

Add below code to functions.php of child theme.

add_filter( 'wpj_phone_verification_key_message_filter', 'wpj_change_sms_key_message', 10, 1 );
function wpj_change_sms_key_message( $verification_key ) {
    $verification_key = 'This is your code for verificattion: ' . $verification_key;
    return $verification_key;
}