diff --git a/src/Bundle/ChillPersonBundle/Resources/views/Person/banner.html.twig b/src/Bundle/ChillPersonBundle/Resources/views/Person/banner.html.twig
index b603dd70c..0e051da2c 100644
--- a/src/Bundle/ChillPersonBundle/Resources/views/Person/banner.html.twig
+++ b/src/Bundle/ChillPersonBundle/Resources/views/Person/banner.html.twig
@@ -25,14 +25,14 @@
                         {% if person.phonenumber %}
                             <span class="phonenumber d-block d-sm-inline-block">
                                 <i class="fa fa-fw fa-phone"></i>
-                                <a href="{{ 'tel:' ~ person.phonenumber }}" class="phone mr-3" title="{{ 'Phonenumber'|trans }}">
+                                <a href="{{ 'tel:' ~ person.phonenumber|phone_number_format('E164') }}" class="phone mr-3" title="{{ 'Phonenumber'|trans }}">
                                     {{ person.phonenumber|chill_format_phonenumber }}</a>
                             </span>
                         {% endif %}
                         {% if person.mobilenumber %}
                             <span class="mobilenumber d-block d-sm-inline-block">
                                 <i class="fa fa-fw fa-mobile"></i>
-                                <a href="{{ 'tel:' ~ person.mobilenumber }}" class="phone mr-3" title="{{ 'Mobilenumber'|trans }}">
+                                <a href="{{ 'tel:' ~ person.mobilenumber|phone_number_format('E164') }}" class="phone mr-3" title="{{ 'Mobilenumber'|trans }}">
                                     {{ person.mobilenumber|chill_format_phonenumber }}</a>
                             </span>
                         {% endif %}
diff --git a/src/Bundle/ChillPersonBundle/Resources/views/Person/list_by_phonenumber.html.twig b/src/Bundle/ChillPersonBundle/Resources/views/Person/list_by_phonenumber.html.twig
index 642225571..754952df0 100644
--- a/src/Bundle/ChillPersonBundle/Resources/views/Person/list_by_phonenumber.html.twig
+++ b/src/Bundle/ChillPersonBundle/Resources/views/Person/list_by_phonenumber.html.twig
@@ -62,12 +62,12 @@
                             <ul>
                                 {% if person.phonenumber is not empty %}
                                     <li>
-                                        <a href="tel:{{ person.phonenumber }}"><img src="{{ asset('build/images/mobile-alt-solid.svg') }}">&nbsp;<pre>{{ person.phonenumber|chill_format_phonenumber }}</pre></a>
+                                        <a href="tel:{{ person.phonenumber|phone_number_format('E164') }}"><img src="{{ asset('build/images/mobile-alt-solid.svg') }}">&nbsp;<pre>{{ person.phonenumber|chill_format_phonenumber }}</pre></a>
                                     </li>
                                 {% endif %}
                                 {% if person.mobilenumber is not empty%}
                                     <li>
-                                        <a href="tel:{{ person.mobilenumber }}"><img src="{{ asset('build/images/phone-alt-solid.svg') }}">&nbsp;<pre>{{ person.mobilenumber|chill_format_phonenumber }}</pre></a>
+                                        <a href="tel:{{ person.mobilenumber|phone_number_format('E164') }}"><img src="{{ asset('build/images/phone-alt-solid.svg') }}">&nbsp;<pre>{{ person.mobilenumber|chill_format_phonenumber }}</pre></a>
                                     </li>
                                 {% endif %}
                             </ul>
diff --git a/src/Bundle/ChillPersonBundle/Resources/views/Person/view.html.twig b/src/Bundle/ChillPersonBundle/Resources/views/Person/view.html.twig
index 920705035..788229e61 100644
--- a/src/Bundle/ChillPersonBundle/Resources/views/Person/view.html.twig
+++ b/src/Bundle/ChillPersonBundle/Resources/views/Person/view.html.twig
@@ -232,14 +232,14 @@ This view should receive those arguments:
                 {%- if chill_person.fields.phonenumber == 'visible' -%}
                         <dl>
                             <dt>{{ 'Phonenumber'|trans }}&nbsp;:</dt>
-                            <dd>{% if person.phonenumber is not empty %}<a href="tel:{{ person.phonenumber|phone_number_format }}">{{ person.phonenumber|chill_format_phonenumber }}</a>{% else %}<span class="chill-no-data-statement">{{ 'No data given'|trans }}{% endif %}</dd>
+                            <dd>{% if person.phonenumber is not empty %}<a href="tel:{{ person.phonenumber|phone_number_format('E164') }}">{{ person.phonenumber|chill_format_phonenumber }}</a>{% else %}<span class="chill-no-data-statement">{{ 'No data given'|trans }}{% endif %}</dd>
                         </dl>
                 {% endif %}
 
                 {%- if chill_person.fields.mobilenumber == 'visible' -%}
                 <dl>
                     <dt>{{ 'Mobilenumber'|trans }}&nbsp;:</dt>
-                    <dd>{% if person.mobilenumber is not empty %}<a href="tel:{{ person.mobilenumber|phone_number_format }}">{{ person.mobilenumber|chill_format_phonenumber }}</a>{% else %}<span class="chill-no-data-statement">{{ 'No data given'|trans }}{% endif %}</dd>
+                    <dd>{% if person.mobilenumber is not empty %}<a href="tel:{{ person.mobilenumber|phone_number_format('E164') }}">{{ person.mobilenumber|chill_format_phonenumber }}</a>{% else %}<span class="chill-no-data-statement">{{ 'No data given'|trans }}{% endif %}</dd>
                     <p>{% if person.acceptSMS %}{{ 'Accept short text message'|trans }}{% endif %}</p>
                 </dl>
                 {% endif %}
@@ -250,7 +250,7 @@ This view should receive those arguments:
                     <dt>{{ 'Others phone numbers'|trans }}&nbsp;:</dt>
                     {% for el in person.otherPhoneNumbers %}
                         {% if el.phonenumber is not empty %}
-                        <dd>{% if el.description is not empty %}{{ el.description }}&nbsp;:&nbsp;{% endif %}<a href="tel:{{ el.phonenumber }}">{{ el.phonenumber|chill_format_phonenumber }}</a></dd>
+                        <dd>{% if el.description is not empty %}{{ el.description }}&nbsp;:&nbsp;{% endif %}<a href="tel:{{ el.phonenumber|phone_number_format('E164') }}">{{ el.phonenumber|chill_format_phonenumber }}</a></dd>
                         {% endif %}
                     {% endfor %}
                     </ul>
diff --git a/src/Bundle/ChillThirdPartyBundle/Resources/views/Entity/thirdparty.html.twig b/src/Bundle/ChillThirdPartyBundle/Resources/views/Entity/thirdparty.html.twig
index 80dcac245..e18425907 100644
--- a/src/Bundle/ChillThirdPartyBundle/Resources/views/Entity/thirdparty.html.twig
+++ b/src/Bundle/ChillThirdPartyBundle/Resources/views/Entity/thirdparty.html.twig
@@ -136,7 +136,7 @@
                 </li>
                 <li><i class="fa fa-li fa-phone"></i>
                     {% if thirdparty.telephone %}
-                        <a href="{{ 'tel:' ~ thirdparty.telephone }}">{{ thirdparty.telephone|chill_format_phonenumber }}</a>
+                        <a href="{{ 'tel:' ~ thirdparty.telephone|phone_number_format('E164') }}">{{ thirdparty.telephone|chill_format_phonenumber }}</a>
                     {% else %}
                         <span class="chill-no-data-statement">{{ 'thirdparty.No_phonenumber'|trans }}</span>
                     {% endif %}