diff --git a/addons/phone_validation/i18n/phone_validation.pot b/addons/phone_validation/i18n/phone_validation.pot
index 79cdfa53314..adbf693decf 100644
--- a/addons/phone_validation/i18n/phone_validation.pot
+++ b/addons/phone_validation/i18n/phone_validation.pot
@@ -185,6 +185,20 @@ msgid ""
 " mass mailing sms anymore, from any list"
 msgstr ""
 
+#. module: phone_validation
+#. odoo-python
+#: code:addons/phone_validation/tools/phone_validation.py:0
+#, python-format
+msgid "Impossible number %s: not a valid country prefix."
+msgstr ""
+
+#. module: phone_validation
+#. odoo-python
+#: code:addons/phone_validation/tools/phone_validation.py:0
+#, python-format
+msgid "Impossible number %s: not enough digits."
+msgstr ""
+
 #. module: phone_validation
 #. odoo-python
 #: code:addons/phone_validation/tools/phone_validation.py:0
@@ -192,6 +206,15 @@ msgstr ""
 msgid "Impossible number %s: probably invalid number of digits."
 msgstr ""
 
+#. module: phone_validation
+#. odoo-python
+#: code:addons/phone_validation/tools/phone_validation.py:0
+#: code:addons/phone_validation/tools/phone_validation.py:0
+#: code:addons/phone_validation/tools/phone_validation.py:0
+#, python-format
+msgid "Impossible number %s: too many digits."
+msgstr ""
+
 #. module: phone_validation
 #: model:ir.model.fields,help:phone_validation.field_mail_thread_phone__mobile_blacklisted
 msgid ""
diff --git a/addons/phone_validation/tools/phone_validation.py b/addons/phone_validation/tools/phone_validation.py
index 918332de8d3..a6465af0613 100644
--- a/addons/phone_validation/tools/phone_validation.py
+++ b/addons/phone_validation/tools/phone_validation.py
@@ -22,7 +22,31 @@ try:
             ) from e
 
         if not phonenumbers.is_possible_number(phone_nbr):
-            raise UserError(_('Impossible number %s: probably invalid number of digits.', number))
+            reason = phonenumbers.is_possible_number_with_reason(phone_nbr)
+            if reason == phonenumbers.ValidationResult.INVALID_COUNTRY_CODE:
+                raise UserError(_('Impossible number %s: not a valid country prefix.', number))
+            if reason == phonenumbers.ValidationResult.TOO_SHORT:
+                raise UserError(_('Impossible number %s: not enough digits.', number))
+            # in case of "TOO_LONG", we may try to reformat the number in case it was
+            # entered without '+' prefix or using leading '++' not always recognized;
+            # in any case final error should keep the original number to ease tracking
+            if reason == phonenumbers.ValidationResult.TOO_LONG:
+                # people may enter 0033... instead of +33...
+                if number.startswith('00'):
+                    try:
+                        phone_nbr = phone_parse(f'+{number.lstrip("00")}', country_code)
+                    except UserError:
+                        raise UserError(_('Impossible number %s: too many digits.', number))
+                # people may enter 33... instead of +33...
+                elif not number.startswith('+'):
+                    try:
+                        phone_nbr = phone_parse(f'+{number}', country_code)
+                    except UserError:
+                        raise UserError(_('Impossible number %s: too many digits.', number))
+                else:
+                    raise UserError(_('Impossible number %s: too many digits.', number))
+            else:
+                raise UserError(_('Impossible number %s: probably invalid number of digits.', number))
         if not phonenumbers.is_valid_number(phone_nbr):
             raise UserError(_('Invalid number %s: probably incorrect prefix.', number))