diff --git a/main/inc/lib/extra_field.lib.php b/main/inc/lib/extra_field.lib.php
index 9d927290ca..69c62f1cd1 100755
--- a/main/inc/lib/extra_field.lib.php
+++ b/main/inc/lib/extra_field.lib.php
@@ -51,7 +51,7 @@ class ExtraField extends Model
     const FIELD_TYPE_TIMEZONE        = 11;
     const FIELD_TYPE_SOCIAL_PROFILE  = 12;
     const FIELD_TYPE_CHECKBOX        = 13;
-    const FIELD_TYPE_TELEPHONE       = 14;
+    const FIELD_TYPE_MOBILE_PHONE_NUMBER       = 14;
 
     public $type = 'user'; //or session or course
     public $handler_id = 'user_id';
@@ -205,7 +205,7 @@ class ExtraField extends Model
         $types[self::FIELD_TYPE_TAG]             = get_lang('FieldTypeTag');
         $types[self::FIELD_TYPE_TIMEZONE]        = get_lang('FieldTypeTimezone');
         $types[self::FIELD_TYPE_SOCIAL_PROFILE]  = get_lang('FieldTypeSocialProfile');
-        $types[self::FIELD_TYPE_TELEPHONE]       = get_lang('FieldTypeTelephone');
+        $types[self::FIELD_TYPE_MOBILE_PHONE_NUMBER] = get_lang('FieldTypeMobilePhoneNumber');
 
         switch ($handler) {
             case 'course':
@@ -1038,17 +1038,21 @@ EOF;
                             $form->freeze('extra_'.$field_details['field_variable']);
                         }
                         break;
-                    case ExtraField::FIELD_TYPE_TELEPHONE:
+                    case ExtraField::FIELD_TYPE_MOBILE_PHONE_NUMBER:
                         $form->addElement(
                             'text', 
-                            'extra_'.$field_details['field_variable'], 
-                            $field_details['field_display_text'],
-                            array('placeholder'  => '(xx)xxxxxxxxx')
+                            'extra_'.$field_details[1],
+                            $field_details[3]." (".get_lang('CountryDialCode').")", 
+                            array('size' => 40, 'placeholder' => '(xx)xxxxxxxxx')
+                        );
+                        $form->applyFilter('extra_'.$field_details[1], 'stripslashes');
+                        $form->applyFilter('extra_'.$field_details[1], 'trim');
+                        $form->applyFilter('extra_'.$field_details[1], 'mobile_phone_number_filter');
+                        $form->addRule(
+                            'extra_'.$field_details[1],
+                            get_lang('MobilePhoneNumberWrong'),
+                            'mobile_phone_number'
                         );
-                        $form->applyFilter('extra_'.$field_details['field_variable'], 'stripslashes');
-                        $form->applyFilter('extra_'.$field_details['field_variable'], 'trim');
-                        $form->applyFilter('extra_'.$field_details['field_variable'], 'telephone');
-                        $form->addRule('extra_'.$field_details[1], get_lang('TelephoneNumberIsWrong'), 'telephone');
                         if ($field_details['field_visible'] == 0) {
                             $form->freeze('extra_'.$field_details['field_variable']);
                         }
diff --git a/main/inc/lib/formvalidator/FormValidator.class.php b/main/inc/lib/formvalidator/FormValidator.class.php
index 3cd4131dcc..185fc64a75 100755
--- a/main/inc/lib/formvalidator/FormValidator.class.php
+++ b/main/inc/lib/formvalidator/FormValidator.class.php
@@ -150,7 +150,7 @@ class FormValidator extends HTML_QuickForm
         $this->registerRule('filetype', null, 'HTML_QuickForm_Rule_Filetype', $dir . 'Rule/Filetype.php');
         $this->registerRule('multiple_required', 'required', 'HTML_QuickForm_Rule_MultipleRequired', $dir . 'Rule/MultipleRequired.php');
         $this->registerRule('url', null, 'HTML_QuickForm_Rule_Url', $dir . 'Rule/Url.php');
-        $this->registerRule('telephone', null, 'HTML_QuickForm_Rule_Telephone', $dir . 'Rule/Telephone.php');
+        $this->registerRule('mobile_phone_number', null, 'HTML_QuickForm_Rule_Mobile_Phone_Number', $dir . 'Rule/MobilePhoneNumber.php');
         $this->registerRule('compare_fields', null, 'HTML_QuickForm_Compare_Fields', $dir . 'Rule/CompareFields.php');
         $this->registerRule('CAPTCHA', 'rule', 'HTML_QuickForm_Rule_CAPTCHA', 'HTML/QuickForm/Rule/CAPTCHA.php');
 
@@ -641,15 +641,12 @@ function html_filter_student_fullpage($html)
 }
 
 /**
- * Cleans telephone text
- * @param string $telephone     Telephone number to clean
- * @return string               The cleaned telephone number
+ * Cleans mobile phone number text
+ * @param string $mobilePhoneNumber     Mobile phone number to clean
+ * @return string                       The cleaned mobile phone number
  */
-function telephone_filter($telephone)
-{
-    $telephone= trim ($telephone,'(');
-    $telephone= trim ($telephone,')');
-    $telephone= ltrim ($telephone,'+');    
-    $telephone= ltrim ($telephone,'0');
-    return $telephone;
+function mobile_phone_number_filter($mobilePhoneNumber)
+{    
+    $mobilePhoneNumber = str_replace(array('+', '(', ')'), '', $mobilePhoneNumber);
+    return ltrim($mobilePhoneNumber,'0');
 }
\ No newline at end of file
diff --git a/main/inc/lib/formvalidator/Rule/MobilePhoneNumber.php b/main/inc/lib/formvalidator/Rule/MobilePhoneNumber.php
new file mode 100755
index 0000000000..d13f517480
--- /dev/null
+++ b/main/inc/lib/formvalidator/Rule/MobilePhoneNumber.php
@@ -0,0 +1,26 @@
+<?php
+
+/**
+ * Abstract base class for QuickForm validation rules
+ */
+require_once 'HTML/QuickForm/Rule.php';
+
+/**
+ * Validate telephones
+ *
+ */
+class HTML_QuickForm_Rule_Mobile_Phone_Number extends HTML_QuickForm_Rule
+{
+
+    /**
+     * Validates mobile phone number
+     *
+     * @param string $mobilePhoneNumber
+     * @return boolean Returns true if valid, false otherwise.
+     */
+    function validate($mobilePhoneNumber)
+    {
+        $rule = "/^\d{11}$/";
+        return preg_match($rule, $mobilePhoneNumber);
+    }
+}
diff --git a/main/inc/lib/usermanager.lib.php b/main/inc/lib/usermanager.lib.php
index 0fb4fd2000..2fc693b118 100755
--- a/main/inc/lib/usermanager.lib.php
+++ b/main/inc/lib/usermanager.lib.php
@@ -30,7 +30,7 @@ class UserManager
     const USER_FIELD_TYPE_TIMEZONE = 11;
     const USER_FIELD_TYPE_SOCIAL_PROFILE = 12;
     const USER_FIELD_TYPE_FILE = 13;
-    const USER_FIELD_TYPE_TELEPHONE  = 14;
+    const USER_FIELD_TYPE_MOBILE_PHONE_NUMBER  = 14;
 
     /**
      * The default constructor only instanciates an empty user object
@@ -4596,13 +4596,21 @@ EOF;
                     }
                     break;
 
-                case self::USER_FIELD_TYPE_TELEPHONE:
-                    $form->addElement('text', 'extra_'.$field_details[1], $field_details[3]." (".get_lang('TelephonePrefix').")",
-                        array('size' => 40, 'placeholder'  => '(xx)xxxxxxxxx'));
+                case self::USER_FIELD_TYPE_MOBILE_PHONE_NUMBER:
+                    $form->addElement(
+                        'text', 
+                        'extra_'.$field_details[1], 
+                        $field_details[3]." (".get_lang('CountryDialCode').")",
+                        array('size' => 40, 'placeholder'  => '(xx)xxxxxxxxx')
+                    );
                     $form->applyFilter('extra_'.$field_details[1], 'stripslashes');
                     $form->applyFilter('extra_'.$field_details[1], 'trim');
-                    $form->applyFilter('extra_'.$field_details[1], 'telephone_filter');
-                    $form->addRule('extra_'.$field_details[1], get_lang('TelephoneNumberIsWrong'), 'telephone');
+                    $form->applyFilter('extra_'.$field_details[1], 'mobile_phone_number_filter');
+                    $form->addRule(
+                        'extra_'.$field_details[1], 
+                        get_lang('MobilePhoneNumberWrong'), 
+                        'mobile_phone_number'
+                    );
                     if (!$admin_permissions) {
                         if ($field_details[7] == 0) {
                             $form->freeze('extra_'.$field_details[1]);
@@ -4635,7 +4643,7 @@ EOF;
         $types[self::USER_FIELD_TYPE_TIMEZONE] = get_lang('FieldTypeTimezone');
         $types[self::USER_FIELD_TYPE_SOCIAL_PROFILE] = get_lang('FieldTypeSocialProfile');
         $types[self::USER_FIELD_TYPE_FILE] = get_lang('FieldTypeFile');
-        $types[self::USER_FIELD_TYPE_TELEPHONE] = get_lang('FieldTypeTelephone');
+        $types[self::USER_FIELD_TYPE_MOBILE_PHONE_NUMBER] = get_lang('FieldTypeMobilePhoneNumber');
 
         return $types;
     }
diff --git a/main/lang/english/trad4all.inc.php b/main/lang/english/trad4all.inc.php
index 40a80c10bd..becbe27bf9 100755
--- a/main/lang/english/trad4all.inc.php
+++ b/main/lang/english/trad4all.inc.php
@@ -1621,4 +1621,7 @@ $DataTableSearch = "Search";
 $HideColumn = "Hide column";
 $DisplayColumn = "Show column";
 $LegalAgreementAccepted = "Legal agreement accepted";
+$FieldTypeMobilePhoneNumber = "Mobile phone";
+$CountryDialCode = "Include the country dial code";
+$MobilePhoneNumberWrong = "Mobile phone number is incomplete or contains not valid characters";
 ?>
\ No newline at end of file
diff --git a/main/lang/spanish/trad4all.inc.php b/main/lang/spanish/trad4all.inc.php
index 7f23e64468..d2b6b59bb3 100644
--- a/main/lang/spanish/trad4all.inc.php
+++ b/main/lang/spanish/trad4all.inc.php
@@ -1613,4 +1613,7 @@ $DataTableSearch = "Buscar";
 $HideColumn = "Ocultar columna";
 $DisplayColumn = "Mostrar columna";
 $LegalAgreementAccepted = "Condiciones legales aceptadas";
+$FieldTypeMobilePhoneNumber = "Número de móvil"; 
+$CountryDialCode = "Incluya el prefijo de llamada del país";
+$MobilePhoneNumberWrong = "El número de móvil que ha escrito está incompleto o contiene caracteres no válidos.";
 ?>
\ No newline at end of file