diff --git a/portail_citoyen/app_settings.py b/portail_citoyen/app_settings.py
index 34036c4..12677d7 100644
--- a/portail_citoyen/app_settings.py
+++ b/portail_citoyen/app_settings.py
@@ -1,3 +1,4 @@
+from django.utils.translation import ugettext_lazy as _
 import sys
 
 class AppSettings(object):
@@ -13,6 +14,13 @@ class AppSettings(object):
                 'allow_redirects': False,
             },
             'PROFILE_FORM_PLUGIN_FORM_CLASS': 'portail_citoyen.forms.ProfileFormPluginForm',
+            'POSTAL_CODE_REGEXP': r'^[0-9]*$',
+            'POSTAL_CODE_MESSAGE': _('Postal code must be five numbers'),
+            'HOME_PHONE_REGEXP': r'^0[1234589][0-9]{8}$',
+            'HOME_PHONE_MESSAGE': _('Phone number must start with 01, 02, 03, 04, 05, 08 or 07 and be ten digits long without spaces'),
+            'MOBILE_PHONE_REGEXP': r'^0[67][0-9]{8}$',
+            'MOBILE_PHONE_MESSAGE': _('Mobile phone number must start with 06 or 07 and be ten digits long without spaces'),
+
     }
 
     __prefix = 'PORTAIL_CITOYEN_'
diff --git a/portail_citoyen/models.py b/portail_citoyen/models.py
index 56ca9a9..8e65e3f 100644
--- a/portail_citoyen/models.py
+++ b/portail_citoyen/models.py
@@ -7,6 +7,8 @@ from django.contrib.auth.models import Group
 
 from authentic2.models import AbstractUser
 
+from . import app_settings
+
 
 class Citoyen(AbstractUser):
     title = models.CharField(pgettext_lazy('person title', 'title'), max_length=16, blank=True,
@@ -20,25 +22,23 @@ class Citoyen(AbstractUser):
     address = models.CharField(_('address'), max_length=128, blank=True)
     postal_code = models.CharField(_('postal code'), max_length=5, blank=True,
             validators=[
-                RegexValidator(r'^[0-9]*$',
-                    _('Postal code must be five numbers'),
-                    _('Invalid postal code')),
-                MinLengthValidator(5),
-                MaxLengthValidator(5)])
+                RegexValidator(app_settings.POSTAL_CODE_REGEXP,
+                    app_settings.POSTAL_CODE_MESSAGE,
+                    'invalid postal code')])
     phone = models.CharField(verbose_name=_("phone"),
             max_length=16, blank=True,
             help_text=_('Phone number must start with 01, 02, 03, 04, 05, 08 or 07 and be ten digits long without spaces'),
             validators=[
-                RegexValidator(r'^0[1234589][0-9]{8}$',
-                    _('Phone number must start with 01, 02, 03, 04, 05, 08 or 07 and be ten digits long without spaces'),
-                    _('Invalid mobile phone number')),])
+                RegexValidator(app_settings.HOME_PHONE_REGEXP,
+                    app_settings.HOME_PHONE_MESSAGE,
+                    'invalid phone'),])
     mobile = models.CharField(verbose_name=_("mobile"),
             max_length=16, blank=True,
             help_text=_('Mobile phone number must start with 06 or 07 and be ten digits long without spaces'),
             validators=[
-                RegexValidator(r'^0[67][0-9]{8}$',
-                    _('Mobile phone number must start with 06 or 07 and be ten digits long without spaces'),
-                    _('Invalid mobile phone number')),])
+                RegexValidator(app_settings.MOBILE_PHONE_REGEXP,
+                    app_settings.MOBILE_PHONE_MESSAGE,
+                    'invalid phone'),])
 
     REQUIRED_FIELDS = ['first_name', 'last_name', 'email']
     USERNAME = 'username'
diff --git a/portail_citoyen/settings.py b/portail_citoyen/settings.py
index b41c296..79c1321 100644
--- a/portail_citoyen/settings.py
+++ b/portail_citoyen/settings.py
@@ -431,6 +431,11 @@ if 'USE_MEMCACHED' in os.environ:
             }
     SESSION_ENGINE = 'django.contrib.sessions.backends.cached_db'
 
+for key in ('POSTAL_CODE_REGEXP', 'POSTAL_CODE_MESSAGE', 'HOME_PHONE_REGEXP', 'HOME_PHONE_MESSAGE', 'MOBILE_PHONE_REGEXP', 'MOBILE_PHONE_MESSAGE'):
+    key = 'PORTAIL_CITOYEN_' + key
+    if key in os.environ:
+        globals()[key] = unicode(os.environ[key], 'utf8')
+
 # try to import local_settings.py (useless, in theory)
 try:
     from portail_citoyen.local_settings import *